chore(deps): update actions/checkout action to v4 (#15)

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

Author: renovate[bot]

.github/workflows/cache.yaml

@@ -13,7 +13,7 @@ jobs:
     env:
       DEBUG: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ./
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}