Update actions/checkout action to v3

Author: renovate[bot]

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
         node-version: [12.x]
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with: