Fixed dotnet hack

[david-driscoll]

https://github.com/actions/setup-dotnet allows side-by-side installs now

[codecov]

Codecov Report

Merging #374 into master will increase coverage by 5.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
+ Coverage   70.27%   75.38%   +5.10%     
==========================================
  Files         443      443              
  Lines       12764    12764              
  Branches     1177     1162      -15     
==========================================
+ Hits         8970     9622     +652     
+ Misses       3383     3142     -241     
+ Partials      411        0     -411     

Impacted Files	Coverage Δ
src/JsonRpc.Generators/Helpers.cs	56.67% <0.00%> (+0.77%)	⬆️
src/Client/LanguageClientOptionsExtensions.cs	42.70% <0.00%> (+1.04%)	⬆️
...t/DebugAdapterClientServiceCollectionExtensions.cs	96.59% <0.00%> (+1.13%)	⬆️
...r/DebugAdapterServerServiceCollectionExtensions.cs	95.89% <0.00%> (+1.36%)	⬆️
...rotocol/Client/WorkDone/WorkDoneProxyExtensions.cs	13.63% <0.00%> (+1.51%)	⬆️
...rc/Client/LanguageClientWorkspaceFoldersManager.cs	94.73% <0.00%> (+1.75%)	⬆️
...erver/LanguageServerServiceCollectionExtensions.cs	97.19% <0.00%> (+1.86%)	⬆️
src/JsonRpc.Testing/Settler.cs	100.00% <0.00%> (+2.00%)	⬆️
...t/TestingUtils/AutoNSubstitute/DryIocExtensions.cs	100.00% <0.00%> (+2.04%)	⬆️
...lient/LanguageClientServiceCollectionExtensions.cs	96.90% <0.00%> (+2.06%)	⬆️
... and 170 more

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