JCR-4453: update pmd-plugin dependency to 3.12.0

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1861781 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/jackrabbit-parent/pom.xml b/jackrabbit-parent/pom.xml
index 39bbecc..c23b845 100644
--- a/jackrabbit-parent/pom.xml
+++ b/jackrabbit-parent/pom.xml
@@ -375,7 +375,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-pmd-plugin</artifactId>
-        <version>3.10.0</version>
+        <version>3.12.0</version>
         <configuration>
           <targetJdk>${java.version}</targetJdk>
         </configuration>