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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: cache node_modules
         uses: actions/cache@v2