Update actions/checkout action to v3.1.0 (#32)

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

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.0.2
+        uses: actions/checkout@v3.1.0
       - name: 'Set up JDK ${{ matrix.java }}'
         uses: actions/[email protected]
         with: