Tests

Update Roslyn to 5.6.0-2.26173.1 #931

Job	Run time
Test (macos-latest, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio.Te...	26m 28s
Test (windows-latest, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio....	19m 36s
Test (ubuntu-22.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest.Te...	19m 55s
Test (macos-latest, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest.Te...	44m 23s
Test (ubuntu-22.04, OmniSharp.Lsp.Tests,OmniSharp.Script.Tests,OmniSharp.Tests,OmniSharp.Stdio.Te...	20m 31s
Test (windows-latest, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.DotNetTest....	18m 44s
	2h 29m 37s

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