Regenerate privateca client (googleapis#6900)

This PR was generated using Autosynth. 🌈


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

```
2021-01-21 03:57:15,793 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/google-api-java-client-services/synth.py.
On branch autosynth-privateca
nothing to commit, working tree clean
2021-01-21 03:57:16,209 synthtool [DEBUG] > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
DEBUG:synthtool:Cloning https://github.com/googleapis/discovery-artifact-manager.git.
2021-01-21 03:57:16,595 synthtool [DEBUG] > Cleaning output directory.
DEBUG:synthtool:Cleaning output directory.
2021-01-21 03:57:16,598 synthtool [DEBUG] > Installing dependencies.
DEBUG:synthtool:Installing dependencies.
2021-01-21 03:57:18,240 synthtool [INFO] > Generating privateca v1beta1.
INFO:synthtool:Generating privateca v1beta1.
2021-01-21 03:57:18,240 synthtool [INFO] > 	1.31.0
INFO:synthtool:	1.31.0
WARNING:root:object without properties CancelOperationRequest: OrderedDict([(u'type', u'object'), (u'description', u'The request message for Operations.CancelOperation.'), (u'properties', OrderedDict()), (u'id', u'CancelOperationRequest')])
WARNING:root:object without properties Empty: OrderedDict([(u'type', u'object'), (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'id', u'Empty'), (u'properties', OrderedDict())])
Writing json metadata to clients/google-api-services-privateca/v1beta1.metadata.json
2021-01-21 03:57:19,788 synthtool [DEBUG] > Wrote metadata to clients/google-api-services-privateca/synth.metadata.
DEBUG:synthtool:Wrote metadata to clients/google-api-services-privateca/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/4a4fb13c-f97c-4f7c-b43e-0df969d5164e/targets

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

Author: yoshi-automation

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

@@ -2,6 +2,6 @@
   "maven": {
     "groupId": "com.google.apis",
     "artifactId": "google-api-services-privateca",
-    "version": "v1beta1-rev20201216-1.31.0"
+    "version": "v1beta1-rev20210119-1.31.0"
   }
 }

clients/google-api-services-privateca/v1beta1/1.31.0/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-privateca</artifactId>
-      <version>v1beta1-rev20201216-1.31.0</version>
+      <version>v1beta1-rev20210119-1.31.0</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  compile 'com.google.apis:google-api-services-privateca:v1beta1-rev20201216-1.31.0'
+  compile 'com.google.apis:google-api-services-privateca:v1beta1-rev20210119-1.31.0'
 }
 ```
 

clients/google-api-services-privateca/v1beta1/1.31.0/com/google/api/services/privateca/v1beta1/model/GoogleApiServicecontrolV1Operation.java

@@ -159,8 +159,9 @@ public final class GoogleApiServicecontrolV1Operation extends com.google.api.cli
   private java.util.List<GoogleApiServicecontrolV1TraceSpan> traceSpans;
 
   /**
-   * User defined labels for the resource that this operation is associated with. Only a combination
-   * of 1000 user labels per consumer project are allowed.
+   * Private Preview. This feature is only available for approved services. User defined labels for
+   * the resource that this operation is associated with. Only a combination of 1000 user labels per
+   * consumer project are allowed.
    * The value may be {@code null}.
    */
   @com.google.api.client.util.Key
@@ -438,17 +439,19 @@ public GoogleApiServicecontrolV1Operation setTraceSpans(java.util.List<GoogleApi
   }
 
   /**
-   * User defined labels for the resource that this operation is associated with. Only a combination
-   * of 1000 user labels per consumer project are allowed.
+   * Private Preview. This feature is only available for approved services. User defined labels for
+   * the resource that this operation is associated with. Only a combination of 1000 user labels per
+   * consumer project are allowed.
    * @return value or {@code null} for none
    */
   public java.util.Map<String, java.lang.String> getUserLabels() {
     return userLabels;
   }
 
   /**
-   * User defined labels for the resource that this operation is associated with. Only a combination
-   * of 1000 user labels per consumer project are allowed.
+   * Private Preview. This feature is only available for approved services. User defined labels for
+   * the resource that this operation is associated with. Only a combination of 1000 user labels per
+   * consumer project are allowed.
    * @param userLabels userLabels or {@code null} for none
    */
   public GoogleApiServicecontrolV1Operation setUserLabels(java.util.Map<String, java.lang.String> userLabels) {

clients/google-api-services-privateca/v1beta1/1.31.0/pom.xml

@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-privateca</artifactId>
-  <version>v1beta1-rev20201216-1.31.0</version>
-  <name>Certificate Authority API v1beta1-rev20201216-1.31.0</name>
+  <version>v1beta1-rev20210119-1.31.0</version>
+  <name>Certificate Authority API v1beta1-rev20210119-1.31.0</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>