chore(deps): update actions/checkout action to v6 (#500)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - run: git config --global core.autocrlf input
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Use Node.js ${{ matrix.node }}
       uses: actions/setup-node@v4
       with: