deps: update dependency com.google.cloud:google-cloud-monitoring to v3.64.0

Author: renovate-bot

google-cloud-spanner/pom.xml

@@ -269,7 +269,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-monitoring</artifactId>
-      <version>3.63.0</version>
+      <version>3.64.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>