deps: update dependency com.google.api.grpc:grpc-google-cloud-monitoring-v3 to v3.78.0

Author: renovate-bot

google-cloud-spanner/pom.xml

@@ -282,7 +282,7 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-cloud-monitoring-v3</artifactId>
-      <version>3.77.0</version>
+      <version>3.78.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>