Bump actions/setup-go from v1 to v2.1.3 (#5)

Author: dependabot[bot]

.github/workflows/pull-request.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-10.15
     steps:
       - name: Set up Go 1.13
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2.1.3
         with:
           go-version: 1.13
         id: go

.github/workflows/release.yaml

@@ -14,7 +14,7 @@ jobs:
     - name: Unshallow
       run: git fetch --prune --unshallow
     - name: Set up Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2.1.3
       with:
         go-version: 1.13.x
     - name: Run GoReleaser