Bump the dotnet group across 1 directory with 2 updates

Bumps the dotnet group with 2 updates in the /tools directory: [Microsoft.CodeAnalysis.Workspaces.MSBuild](https://github.com/dotnet/roslyn) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `Microsoft.CodeAnalysis.Workspaces.MSBuild` from 4.11.0 to 4.12.0
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/main/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

Updates `xunit.runner.visualstudio` from 2.8.2 to 3.0.0
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.8.2...3.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.Workspaces.MSBuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dotnet
...

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

tools/ExampleTester/ExampleTester.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Build.Locator" Version="1.7.8" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.11.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.12.0" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>
 

tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="XMLUnit.Core" Version="2.10.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>