Use java 21 for running the dependency checks

Author: laeubi

.github/workflows/checkDependencies.yml

@@ -84,7 +84,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018 # v4.2.2
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: maven
       - name: Check ${{ matrix.bundles }}