Bump libraries-bom from 19.0.0 to 19.2.0 (#397)

Bumps [libraries-bom](https://github.com/GoogleCloudPlatform/cloud-opensource-java) from 19.0.0 to 19.2.0.
- [Release notes](https://github.com/GoogleCloudPlatform/cloud-opensource-java/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/master/CHANGELOG.md)
- [Commits](https://github.com/GoogleCloudPlatform/cloud-opensource-java/commits)

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spring-cloud-gcp-dependencies/pom.xml

@@ -29,7 +29,7 @@
 	</distributionManagement>
 
 	<properties>
-		<gcp-libraries-bom.version>19.0.0</gcp-libraries-bom.version>
+		<gcp-libraries-bom.version>19.2.0</gcp-libraries-bom.version>
 		<cloud-sql-socket-factory.version>1.2.1</cloud-sql-socket-factory.version>
 		<guava.version>30.1-jre</guava.version>
 	</properties>