deps: update dependency com.google.api.grpc:proto-google-cloud-pubsub-v1 to v1.88.0 (#176)

Author: renovate-bot

pom.xml

@@ -223,7 +223,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-pubsub-v1</artifactId>
-        <version>1.87.0</version>
+        <version>1.88.0</version>
         <scope>test</scope>
       </dependency>
       <dependency>