Update actions/setup-go requirement to v2.1.2 (#7042)

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/8a3a76c2171de8c3be20bec507b6d829ccae48ba)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>

.github/workflows/sims.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
     steps:
-      - uses: actions/setup-go@v2-beta
+      - uses: actions/setup-go@v2.1.2
       - name: install runsim
         run: |
           export GO111MODULE="on" && go get github.com/cosmos/tools/cmd/runsim@v1.0.0

.github/workflows/tag.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Install Go
-        uses: actions/setup-go@v1
+        uses: actions/setup-go@v2.1.2
         with:
           go-version: 1.14
       - name: Unshallow