fix: Upgrading checkout action - fixing git reference issue

Author: evertonfraga

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - run: npm install
       - run: npm run test