Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Set up JDK 21
         uses: actions/setup-java@v5

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
           java-version: 21
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           token: ${{ secrets.REPO_ACCESS_TOKEN }}