Bump OmniSharp.Extensions.LanguageClient from 0.17.2 to 0.17.4 (#1345)

Bumps [OmniSharp.Extensions.LanguageClient](https://github.com/OmniSharp/csharp-language-server-protocol) from 0.17.2 to 0.17.4.
- [Release notes](https://github.com/OmniSharp/csharp-language-server-protocol/releases)
- [Changelog](https://github.com/OmniSharp/csharp-language-server-protocol/blob/master/GitReleaseManager.yaml)
- [Commits](OmniSharp/csharp-language-server-protocol@v0.17.2...v0.17.4)

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Author: dependabot-preview[bot]

test/PowerShellEditorServices.Test.E2E/PowerShellEditorServices.Test.E2E.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.6" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
-    <PackageReference Include="OmniSharp.Extensions.LanguageClient" Version="0.17.2" />
+    <PackageReference Include="OmniSharp.Extensions.LanguageClient" Version="0.17.4" />
     <PackageReference Include="xunit" Version="2.4.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />