Updat to PMD 7.21.0

Author: AB-xdev

.config/pmd/java/ruleset.xml

@@ -146,7 +146,6 @@
 	<rule ref="category/java/errorprone.xml/CollectionTypeMismatch"/>
 	<rule ref="category/java/errorprone.xml/ComparisonWithNaN"/>
 	<rule ref="category/java/errorprone.xml/DoNotCallGarbageCollectionExplicitly"/>
-	<rule ref="category/java/errorprone.xml/DontImportSun"/>
 	<rule ref="category/java/errorprone.xml/DontUseFloatTypeForLoopIndices"/>
 	<rule ref="category/java/errorprone.xml/EqualsNull"/>
 	<rule ref="category/java/errorprone.xml/IdempotentOperations"/>
@@ -164,6 +163,7 @@
 	<rule ref="category/java/errorprone.xml/SingletonClassReturningNewInstance"/>
 	<rule ref="category/java/errorprone.xml/UnconditionalIfStatement"/>
 	<rule ref="category/java/errorprone.xml/UnnecessaryCaseChange"/>
+	<rule ref="category/java/errorprone.xml/UnsupportedJdkApiUsage"/>
 	<rule ref="category/java/errorprone.xml/UselessPureMethodCall"/>