build: migrate release scripts (#1799) (#1584)

Source-Link: googleapis/synthtool@1fd6dff
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:ad9cabee4c022f1aab04a71332369e0c23841062124818a4490f73337f790337

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

.github/.OwlBot.lock.yaml

@@ -13,4 +13,4 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:8dd8395defb6a5069b0b10c435058bf13980606ba1967e2b3925ed50fc3cb22f
+  digest: sha256:ad9cabee4c022f1aab04a71332369e0c23841062124818a4490f73337f790337

.github/release-trigger.yml

@@ -1 +1,2 @@
 enabled: true
+multiScmName: java-pubsub

README.md

@@ -52,20 +52,20 @@ If you are using Maven without the BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.14.0')
+implementation platform('com.google.cloud:libraries-bom:26.15.0')
 
 implementation 'com.google.cloud:google-cloud-pubsub'
 ```
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-pubsub:1.123.11'
+implementation 'com.google.cloud:google-cloud-pubsub:1.123.12'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-pubsub" % "1.123.11"
+libraryDependencies += "com.google.cloud" % "google-cloud-pubsub" % "1.123.12"
 ```
 <!-- {x-version-update-end} -->
 
@@ -406,7 +406,7 @@ 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-pubsub/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-pubsub.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-pubsub/1.123.11
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-pubsub/1.123.12
 [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