Update actions/checkout action to v4 (#12)

Co-authored-by: ske-renovate-ce[bot] <163154779+ske-renovate-ce[bot]@users.noreply.github.com>

Author: ske-renovate-ce[bot]

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Run check
       run: make check