CI build: add Temurin JDK 22

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

.github/workflows/maven.yml

     strategy:
       fail-fast: false
       matrix:
-        # AspectJ_JDK_Update
+        # AspectJ_JDK_Update: Always keep LTS versions + latest version supported by JDT Core
         # Check for available Temurin releases on https://adoptium.net/releases.html
-        java: [ 17, 21 ]
+        java: [ 17, 21, 22 ]
 
     runs-on: ubuntu-latest