Add UnnecessaryWarningSuppression

https://pmd.github.io/pmd/pmd_rules_java_bestpractices.html#unnecessarywarningsuppression

Detects unused suppressions

Author: AB-xdev

.config/pmd/java/ruleset.xml

@@ -25,6 +25,7 @@
 	<rule ref="category/java/bestpractices.xml/PreserveStackTrace"/>
 	<rule ref="category/java/bestpractices.xml/SimplifiableTestAssertion"/>
 	<rule ref="category/java/bestpractices.xml/SystemPrintln"/>
+	<rule ref="category/java/bestpractices.xml/UnnecessaryWarningSuppression"/>
 	<rule ref="category/java/bestpractices.xml/UnusedAssignment"/>
 	<rule ref="category/java/bestpractices.xml/UnusedFormalParameter"/>
 	<rule ref="category/java/bestpractices.xml/UnusedPrivateField"/>