chore(deps): update dependency com.google.api.grpc:proto-google-common-protos to v2.21.0

Author: renovate[bot]

pom.xml

@@ -93,7 +93,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-common-protos</artifactId>
-        <version>2.9.2</version><!-- {x-version-update:proto-google-common-protos:current} -->
+        <version>2.21.0</version><!-- {x-version-update:proto-google-common-protos:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.guava</groupId>