Update actions/checkout action to v3

Author: renovate[bot]

.github/workflows/CI.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v1
         with:
           node-version: "18.12.1"