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

Author: renovate[bot]

.github/workflows/npm-test.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Use Node.js
       uses: actions/setup-node@v3
       with: