Update dependency xunit.runner.visualstudio to v4

Author: renovate[bot]

src/Cody.VisualStudio.Tests/Cody.VisualStudio.Tests.csproj

@@ -94,7 +94,7 @@
       <Version>2.9.0</Version>
     </PackageReference>
     <PackageReference Include="xunit.runner.visualstudio">
-      <Version>2.8.2</Version>
+      <Version>4.0.0</Version>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>