chore(deps): update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.9.0 (googleapis#828)

Author: renovate-bot

pom.xml

@@ -222,7 +222,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
+        <version>3.9.0</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>