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

Author: renovate[bot]

.github/workflows/update-contributors.yml

@@ -14,7 +14,7 @@ jobs:
       pull-requests: write  # Needed for creating PRs
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Node.js
         uses: actions/setup-node@v3