Use checkout@v2 in GitHub Actions

Author: amancevice

.github/workflows/build.yml

@@ -8,13 +8,13 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
       - run: npm install -g dockerlint
       - run: dockerlint
   build:
     runs-on: ubuntu-latest
     needs: lint
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - run: make

.github/workflows/push.yml

@@ -7,15 +7,15 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
       - run: npm install -g dockerlint
       - run: dockerlint
   build-push:
     runs-on: ubuntu-latest
     needs: lint
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: azure/docker-login@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}