deps: Update dependency com.google.api:gax-grpc to v2.47.0 (#515)

Author: renovate-bot

pom.xml

@@ -142,7 +142,7 @@
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax-grpc</artifactId>
-        <version>2.46.1</version>
+        <version>2.47.0</version>
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>