Pick up maven-checkstyle-plugin version from parent POM

Author: garydgregory

pom.xml

@@ -168,7 +168,6 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <commons.encoding>UTF-8</commons.encoding>
 
-    <commons.checkstyle-plugin.version>3.2.0</commons.checkstyle-plugin.version>
     <commons.checkstyle.version>9.3</commons.checkstyle.version>
     <checkstyle.header.file>${basedir}/src/site/resources/checkstyle/checkstyle-header.txt</checkstyle.header.file>
     <checkstyle.config.file>${basedir}/src/site/resources/checkstyle/checkstyle.xml</checkstyle.config.file>