Bump actions/checkout from 1 to 2.3.4 (#1)

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v1...v2.3.4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2.3.4
       - name: Set env
         run: echo ::set-env name=RELEASE_VERSION::${GITHUB_REF:10}
       - name: Build

.github/workflows/test.yaml

@@ -13,7 +13,7 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2.3.4
       - uses: actions/cache@v1
         with:
           path: ~/go/pkg/mod