Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
           - 14.x
           - 16.x
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v5
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2
         with: