Bump actions/setup-dotnet from 1 to 2 (#2737)

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 1 to 2.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](https://github.com/actions/setup-dotnet/compare/v1...v2)

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

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

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

.github/workflows/build-frontends.yml

@@ -15,7 +15,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v2
       with:
         dotnet-version: 6.0.x