Update actions/setup-java action to v6 (#128)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up JDK 17
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@v6
         with:
           java-version: '17'
           distribution: 'zulu'