update

Author: yeikel

.github/workflows/backend_tests.yml

@@ -26,7 +26,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Set up JDK
-        uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # infered from @v4
+        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # https://github.com/actions/setup-java/releases/tag/v5.0.0
         with:
           java-version: '21'
           distribution: 'zulu'