Update actions/setup-dotnet action to v2.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-dotnet	action	minor	v2.0.0 -> v2.1.0

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Release Notes

actions/setup-dotnet

v2.1.0

Compare Source

This release includes the following PRs:

• Adding support for the global-json-file input: #​276
  Example of usage:

  - uses: actions/setup-dotnet@v2
    with:
      global-json-file: csharp/global.json
  - run: dotnet build <my project>
    working-directory: csharp

• Update @​zeit/ncc to @​vercel/ncc: #​290

• Update vulnerable packages: #​289

• Improve documentation and update installer scripts to the latest version: #​278

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Configuration

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