chore(deps): update actions/checkout action to v3 (#14)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
         node-version: [12, 14]
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2
         with: