Bump the tests group across 1 directory with 3 updates

Bumps the tests group with 3 updates in the / directory: [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest), [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `Microsoft.NET.Test.Sdk` from 17.6.3 to 17.12.0
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Changelog](https://github.com/microsoft/vstest/blob/main/docs/releases.md)
- [Commits](microsoft/vstest@v17.6.3...v17.12.0)

Updates `xunit` from 2.4.2 to 2.9.3
- [Commits](xunit/xunit@v2-2.4.2...v2-2.9.3)

Updates `xunit.runner.visualstudio` from 2.4.5 to 3.0.1
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.4.5...3.0.1)

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- 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-major
  dependency-group: tests
...

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

src/VisualStudio.Tests/VisualStudio.Tests.csproj

@@ -7,10 +7,10 @@
 
   <ItemGroup>
     <PackageReference Include="DotNetConfig" Version="1.0.6" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <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="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1" />
   </ItemGroup>
 
   <ItemGroup>