build(deps): bump actions/setup-go from 2.1.4 to 2.1.5

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 2.1.4 to 2.1.5.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/compare/v2.1.4...v2.1.5)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
 
       - name: Set up Go 1.15
-        uses: actions/setup-go@v2.1.4
+        uses: actions/setup-go@v2.1.5
         with:
           go-version: 1.15
         id: go