deps: update dependency com.google.api.grpc:grpc-google-common-protos to v2.9.6

Author: renovate[bot]

pom.xml

@@ -81,7 +81,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-common-protos</artifactId>
-        <version>2.9.2</version><!-- {x-version-update:grpc-google-common-protos:current} -->
+        <version>2.9.6</version><!-- {x-version-update:grpc-google-common-protos:current} -->
       </dependency>
       <dependency>
         <groupId>io.grpc</groupId>