Merge pull request #9330 from mbien/rp-updates

RequestProcessor warning fixes and minor update

Author: mbien

platform/openide.util/nbproject/project.properties

@@ -14,7 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-javac.release=17
+javac.release=21
 javac.compilerargs=-Xlint -Xlint:-serial
 javadoc.arch=${basedir}/arch.xml
 module.jar.dir=lib