Bump guava-bom from 30.0-jre to 30.1-jre (GoogleCloudPlatform#384)

Bumps [guava-bom](https://github.com/google/guava) from 30.0-jre to 30.1-jre.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

spring-cloud-gcp-dependencies/pom.xml

@@ -31,7 +31,7 @@
 	<properties>
 		<gcp-libraries-bom.version>19.0.0</gcp-libraries-bom.version>
 		<cloud-sql-socket-factory.version>1.2.1</cloud-sql-socket-factory.version>
-		<guava.version>30.0-jre</guava.version>
+		<guava.version>30.1-jre</guava.version>
 	</properties>
 
 	<dependencyManagement>