Update actions/checkout action to v3 (#21)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
         node-version: [14, 16]
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Use Node ${{ matrix.node-version }}
         uses: actions/setup-node@master