migrate to java 21 bevore migrating to java 25 (#739)

Co-authored-by: Tim te Beek <tim@moderne.io>

Author: MBoegers

src/main/resources/META-INF/rewrite/java-version-25.yml

@@ -25,6 +25,7 @@ description: >-
 tags:
   - java25
 recipeList:
+  - org.openrewrite.java.migrate.UpgradeToJava21
   - org.openrewrite.java.migrate.RemoveSecurityAccessController
   - org.openrewrite.java.migrate.RemoveSecurityPolicy
   - org.openrewrite.java.migrate.RemoveSecurityManager