deps: update dependency com.google.cloud:google-cloud-monitoring to v3.9.0 (#2230)

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -23,7 +23,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <opencensus.version>0.31.1</opencensus.version>
     <trace.version>2.7.0</trace.version>
-    <cloudmonitoring.version>3.8.0</cloudmonitoring.version>
+    <cloudmonitoring.version>3.9.0</cloudmonitoring.version>
   </properties>
 
 

samples/snapshot/pom.xml

@@ -23,7 +23,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <opencensus.version>0.31.1</opencensus.version>
     <trace.version>2.7.0</trace.version>
-    <cloudmonitoring.version>3.8.0</cloudmonitoring.version>
+    <cloudmonitoring.version>3.9.0</cloudmonitoring.version>
   </properties>
 
   <dependencies>