Bump actions/setup-dotnet from 1 to 2
Bump actions/setup-dotnet from 1 to 2

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)
martincostello/project-euler