ci: [java] automatic kokoro label in and /gcbrun comment (#1965)

Source-Link: googleapis/synthtool@bd2bae8
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:72f0d373307d128b2cb720c5cb4d90b31f0e86529dd138c632710ae0c69efae3

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:31aa2ef27b071c2e7844b0eb1d5a24254daff06615b1b138b994dd6345c0b0ea
-# created: 2024-05-17T15:15:57.6714113Z
+  digest: sha256:72f0d373307d128b2cb720c5cb4d90b31f0e86529dd138c632710ae0c69efae3
+# created: 2024-06-05T18:32:21.724930324Z

.github/trusted-contribution.yml

@@ -1,3 +1,9 @@
 trustedContributors:
 - renovate-bot
 - gcf-owl-bot[bot]
+
+annotations:
+- type: comment
+  text: "/gcbrun"
+- type: label
+  text: "kokoro:force-run"

README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-spanner'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-spanner:6.68.0'
+implementation 'com.google.cloud:google-cloud-spanner:6.68.1'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.68.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.68.1"
 ```
 <!-- {x-version-update-end} -->
 
@@ -671,7 +671,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.68.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.68.1
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles