GH-10 Update actions/setup-java action to v4.2.1 (#10)

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

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Checkout
         uses: actions/[email protected]
       - name: 'Set up JDK ${{ matrix.java }}'
-        uses: actions/setup-java@v4.0.0
+        uses: actions/setup-java@v4.2.1
         with:
           distribution: adopt
           java-version: '${{ matrix.java }}'