Update dependency com.google.cloud:libraries-bom to v26.60.0 (#3157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

flink-connectors/flink-connector-gcp-pubsub/pom.xml

@@ -35,7 +35,7 @@ under the License.
 	<packaging>jar</packaging>
 
 	<properties>
-		<google-cloud-libraries-bom.version>26.59.0</google-cloud-libraries-bom.version>
+		<google-cloud-libraries-bom.version>26.60.0</google-cloud-libraries-bom.version>
 	</properties>
 
 	<dependencyManagement>