deps: update dependency com.google.cloud:grpc-gcp to v1.2.1

Author: renovate-bot

Diff for: first-party-dependencies/pom.xml

@@ -57,7 +57,7 @@
     <site.installationModule>${project.artifactId}</site.installationModule>
     <grpc.version>1.47.0</grpc.version>
     <gax.version>2.18.4</gax.version>
-    <grpc-gcp.version>1.1.0</grpc-gcp.version>
+    <grpc-gcp.version>1.2.1</grpc-gcp.version>
     <guava.version>31.1-jre</guava.version>
     <protobuf.version>3.21.2</protobuf.version>
     <google.api-common.version>2.2.1</google.api-common.version>