Update actions/checkout action to v3

Author: renovate-bot

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
   ci:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
           node-version: '14'