Bump the tests group with 2 updates

Bumps the tests group with 2 updates: [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.4.2 to 2.6.1
- [Commits](xunit/xunit@2.4.2...2.6.1)

Updates `xunit.runner.visualstudio` from 2.4.5 to 2.5.3
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@v2.4.5...2.5.3)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
...

Signed-off-by: dependabot[bot] <[email protected]>

src/VisualStudio.Tests/VisualStudio.Tests.csproj

@@ -9,8 +9,8 @@
     <PackageReference Include="DotNetConfig" Version="1.0.6" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.3" />
     <PackageReference Include="Moq" Version="4.18.4" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
+    <PackageReference Include="xunit" Version="2.6.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
   </ItemGroup>
 
   <ItemGroup>