(maint): Bump actions/setup-dotnet from 1 to 2 (#87)

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

@@ -48,7 +48,7 @@ jobs:
         run: git fetch --prune --unshallow
 
       - name: Install .NET SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:          
           # gitversion needs 5.0 and we need all SDKs the project is targeting
           dotnet-version: |