The setup JRE task should configure Java 21 now

Author: merks

releng/org.eclipse.pde.setup/PDE.setup

@@ -92,8 +92,8 @@
       storageURI="scope://Workspace"/>
   <setupTask
       xsi:type="jdt:JRETask"
-      version="JavaSE-17"
-      location="${jre.location-17}"/>
+      version="JavaSE-21"
+      location="${jre.location-21}"/>
   <setupTask
       xsi:type="git:GitCloneTask"
       id="github.clone.pde"