Bump maven-pmd-plugin from 3.17.0 to 3.18.0 apache#128

Author: garydgregory

src/changes/changes.xml

@@ -149,7 +149,7 @@
         Update maven-checkstyle-plugin from 3.0.0 to 3.2.0, #76, #129.
       </action>
       <action dev="ggregory" type="update" due-to="Gary Gregory, Dependabot">
-        Update maven-pmd-plugin from 3.12.0 to 3.17.0, #120.
+        Update maven-pmd-plugin from 3.12.0 to 3.18.0, #120, #128.
       </action>
       <action dev="ggregory" type="update" due-to="Gary Gregory">
         Update BC version from 1.9.3 to 1.9.4.