Update parent pom to require Java 21

Signed-off-by: Alexander Brandes <mc.cache@web.de>

Author: NotMyFault

pom.xml

@@ -28,7 +28,7 @@ THE SOFTWARE.
   <parent>
     <groupId>org.jenkins-ci</groupId>
     <artifactId>jenkins</artifactId>
-    <version>1.142</version>
+    <version>2.1326.v00b_e26755312</version>
     <relativePath />
   </parent>