Update actions/checkout requirement to v2.3.4 (#3)

Author: dependabot[bot]

.github/workflows/pull-request.yaml

@@ -16,7 +16,7 @@ jobs:
           go-version: 1.13
         id: go
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2.3.4
       - name: Run GoReleaser
         uses: goreleaser/[email protected]
         with:

.github/workflows/release.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
     - name: Unshallow
       run: git fetch --prune --unshallow
     - name: Set up Go