Upgrade maven-pmd-plugin to 3.12.0

Change-Id: I5ae0f0573aae3da3789fecdad494a2dd243e780b
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -328,7 +328,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-pmd-plugin</artifactId>
-          <version>3.11.0</version>
+          <version>3.12.0</version>
           <configuration>
             <sourceEncoding>utf-8</sourceEncoding>
             <minimumTokens>100</minimumTokens>