Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/.ci.yml

@@ -8,7 +8,7 @@ jobs:
         node-version: [16.x, 18.x, 20.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with: