deps: update dependency com.google.auth:google-auth-library-bom to v0.21.1 (#252)

Author: renovate-bot

pom.xml

@@ -155,7 +155,7 @@
     <google.api-common.version>1.9.3</google.api-common.version>
     <google.common-protos.version>1.18.0</google.common-protos.version>
     <google.iam.version>0.13.0</google.iam.version>
-    <google.auth.version>0.21.0</google.auth.version>
+    <google.auth.version>0.21.1</google.auth.version>
     <google.api.version>1.30.9</google.api.version>
     <google.http.version>1.36.0</google.http.version>
     <grpc.version>1.30.2</grpc.version>