Merge pull request #507 from graphql-java-kickstart/renovate/org.apache.maven.plugins-maven-compiler-plugin-3.x

Update dependency org.apache.maven.plugins:maven-compiler-plugin to v3.8.1

Author: oryan-block

pom.xml

@@ -242,7 +242,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.3</version>
+                <version>3.8.1</version>
                 <configuration>
                     <source>1.8</source>
                     <target>1.8</target>