Update .NET SDKs #799

Job	Run time
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest.Te...	17m 37s
Test (ubuntu-20.04, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio.Te...	27m 31s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest.Te...	25m 53s
Test (windows-2022, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio.Te...	17m 23s
Test (macos-12, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest.Tests,...	22m 48s
Test (macos-12, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio.Tests,...	28m 50s
	2h 20m 2s

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