Bump actions/checkout from 4 to 5 (#1080)

Author: dependabot[bot]

.github/workflows/testing.yml

@@ -15,7 +15,7 @@ jobs:
     name: Java ${{ matrix.Java }} testing
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           # Disabling shallow clone is recommended for improving relevancy of reporting
           fetch-depth: 0