ci: add jdk 25

Author: Pfeil

.github/workflows/gradle.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        jdk: [21] # (open)JDK releases
+        jdk: [21, 25] # (open)JDK releases
     runs-on: ${{ matrix.os }}
 
     steps: