Bump actions/setup-go from 1 to 2.1.5

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 1 to 2.1.5.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v1...v2.1.5)

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2.1.5
         with:
           go-version: 1.15
       - uses: actions/checkout@v1
@@ -34,7 +34,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2.1.5
         with:
           go-version: 1.15
       - uses: actions/checkout@v1
@@ -49,7 +49,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2.1.5
         with:
           go-version: 1.15
       - uses: actions/checkout@v1

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       # Required for the changelog to work correctly
       - run: git fetch --prune --unshallow
 
-      - uses: actions/setup-go@v1
+      - uses: actions/setup-go@v2.1.5
         with:
           go-version: 1.15