chore(deps): update dependency org.apache.maven.plugins:maven-compiler-plugin to v3 (googleapis#1475)

Author: renovate-bot

pom.xml

@@ -243,7 +243,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-compiler-plugin</artifactId>
-          <version>2.3.2</version>
+          <version>3.8.1</version>
           <configuration>
             <source>1.7</source>
             <target>1.7</target>