Update actions/checkout action to v5 (#64)

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

Author: renovate[bot]

.github/workflows/test-java.yml

@@ -15,7 +15,7 @@ jobs:
     name: 'Build'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache local Maven repository
         uses: actions/cache@v4
         with:
@@ -36,7 +36,7 @@ jobs:
     name: 'Javadoc'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Cache local Maven repository
         uses: actions/cache@v4
         with: