Update actions/checkout action to v3 (#485)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         node-version: [10.x, 12.x, 14.x, 16.x, 17.x]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v2
       with: