Regenerate firestore client (googleapis#5859)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-09-04 03:51:17,828 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/google-api-java-client-services/synth.py.
On branch autosynth-firestore
nothing to commit, working tree clean
2020-09-04 03:51:18,174 synthtool [DEBUG] > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
DEBUG:synthtool:Cloning https://github.com/googleapis/discovery-artifact-manager.git.
2020-09-04 03:51:18,560 synthtool [DEBUG] > Cleaning output directory.
DEBUG:synthtool:Cleaning output directory.
2020-09-04 03:51:18,562 synthtool [DEBUG] > Installing dependencies.
DEBUG:synthtool:Installing dependencies.
2020-09-04 03:51:20,191 synthtool [INFO] > Generating firestore v1beta2.
INFO:synthtool:Generating firestore v1beta2.
2020-09-04 03:51:20,191 synthtool [INFO] > 	1.30.1
INFO:synthtool:	1.30.1
WARNING:root:object without properties Empty: OrderedDict([(u'id', u'Empty'), (u'properties', OrderedDict()), (u'description', u'A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.'), (u'type', u'object')])
Writing json metadata to clients/google-api-services-firestore/v1beta2.metadata.json
2020-09-04 03:51:20,842 synthtool [INFO] > Generating firestore v1beta1.
INFO:synthtool:Generating firestore v1beta1.
2020-09-04 03:51:20,842 synthtool [INFO] > 	1.30.1
INFO:synthtool:	1.30.1
WARNING:root:object without properties Empty: OrderedDict([(u'properties', OrderedDict()), (u'type', u'object'), (u'id', u'Empty'), (u'description', u'A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.')])
WARNING:root:object without properties GoogleFirestoreAdminV1beta1LocationMetadata: OrderedDict([(u'id', u'GoogleFirestoreAdminV1beta1LocationMetadata'), (u'type', u'object'), (u'description', u'The metadata message for google.cloud.location.Location.metadata.'), (u'properties', OrderedDict())])
Writing json metadata to clients/google-api-services-firestore/v1beta1.metadata.json
2020-09-04 03:51:22,007 synthtool [INFO] > Generating firestore v1.
INFO:synthtool:Generating firestore v1.
2020-09-04 03:51:22,007 synthtool [INFO] > 	1.30.1
INFO:synthtool:	1.30.1
WARNING:root:object without properties Empty: OrderedDict([(u'properties', OrderedDict()), (u'id', u'Empty'), (u'description', u'A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.'), (u'type', u'object')])
WARNING:root:object without properties GoogleFirestoreAdminV1LocationMetadata: OrderedDict([(u'description', u'The metadata message for google.cloud.location.Location.metadata.'), (u'properties', OrderedDict()), (u'type', u'object'), (u'id', u'GoogleFirestoreAdminV1LocationMetadata')])
WARNING:root:object without properties GoogleLongrunningCancelOperationRequest: OrderedDict([(u'description', u'The request message for Operations.CancelOperation.'), (u'type', u'object'), (u'id', u'GoogleLongrunningCancelOperationRequest'), (u'properties', OrderedDict())])
Writing json metadata to clients/google-api-services-firestore/v1.metadata.json
2020-09-04 03:51:23,355 synthtool [DEBUG] > Wrote metadata to clients/google-api-services-firestore/synth.metadata.
DEBUG:synthtool:Wrote metadata to clients/google-api-services-firestore/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/8629523d-7fc1-42ea-a5be-39644a0c6590/targets

- [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

clients/google-api-services-firestore/v1.metadata.json

@@ -2,6 +2,6 @@
   "maven": {
     "groupId": "com.google.apis",
     "artifactId": "google-api-services-firestore",
-    "version": "v1-rev20200818-1.30.10"
+    "version": "v1-rev20200821-1.30.10"
   }
 }

clients/google-api-services-firestore/v1/1.30.1/README.md

@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-firestore</artifactId>
-      <version>v1-rev20200818-1.30.10</version>
+      <version>v1-rev20200821-1.30.10</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  compile 'com.google.apis:google-api-services-firestore:v1-rev20200818-1.30.10'
+  compile 'com.google.apis:google-api-services-firestore:v1-rev20200821-1.30.10'
 }
 ```
 

clients/google-api-services-firestore/v1/1.30.1/pom.xml

@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-firestore</artifactId>
-  <version>v1-rev20200818-1.30.10</version>
-  <name>Cloud Firestore API v1-rev20200818-1.30.10</name>
+  <version>v1-rev20200821-1.30.10</version>
+  <name>Cloud Firestore API v1-rev20200821-1.30.10</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>

clients/google-api-services-firestore/v1/1.30.1/resources/firestore.v1.json

@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-firestore</artifactId>
-      <version>v1-rev20200818-1.30.10</version>
+      <version>v1-rev20200821-1.30.10</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  compile 'com.google.apis:google-api-services-firestore:v1-rev20200818-1.30.10'
+  compile 'com.google.apis:google-api-services-firestore:v1-rev20200821-1.30.10'
 }
 ```
 

clients/google-api-services-firestore/v1/README.md

@@ -2,6 +2,6 @@
   "maven": {
     "groupId": "com.google.apis",
     "artifactId": "google-api-services-firestore",
-    "version": "v1beta1-rev20200818-1.30.10"
+    "version": "v1beta1-rev20200822-1.30.10"
   }
 }

clients/google-api-services-firestore/v1beta1.metadata.json

@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-firestore</artifactId>
-      <version>v1beta1-rev20200818-1.30.10</version>
+      <version>v1beta1-rev20200822-1.30.10</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  compile 'com.google.apis:google-api-services-firestore:v1beta1-rev20200818-1.30.10'
+  compile 'com.google.apis:google-api-services-firestore:v1beta1-rev20200822-1.30.10'
 }
 ```
 

clients/google-api-services-firestore/v1beta1/1.30.1/README.md

@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-firestore</artifactId>
-  <version>v1beta1-rev20200818-1.30.10</version>
-  <name>Cloud Firestore API v1beta1-rev20200818-1.30.10</name>
+  <version>v1beta1-rev20200822-1.30.10</version>
+  <name>Cloud Firestore API v1beta1-rev20200822-1.30.10</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>