Update actions/setup-go requirement to v2.1.3

Updates the requirements on [actions/setup-go](https://github.com/actions/setup-go) to permit the latest version.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/commits/37335c7bb261b353407cff977110895fa0b4f7d8)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/acceptance-tests.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Set up Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2.1.3
       with:
         go-version: 1.15
       id: go
@@ -27,7 +27,7 @@ jobs:
     if: ${{ github.event_name == 'push' }}
     steps:
     - name: Set up Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2.1.3
       with:
         go-version: 1.15
       id: go

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
         run: git fetch --prune --unshallow
       -
         name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v2.1.3
         with:
           go-version: 1.15
       -

.github/workflows/unit-tests.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
     - name: Set up Go
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2.1.3
       with:
         go-version: ${{ matrix.go }}
       id: go