Bump the dev-dependencies group across 1 directory with 2 updates

Bumps the dev-dependencies group with 2 updates in the / directory: [CommunityToolkit.Mvvm](https://github.com/CommunityToolkit/dotnet) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `CommunityToolkit.Mvvm` from 8.3.2 to 8.4.0
- [Release notes](https://github.com/CommunityToolkit/dotnet/releases)
- [Commits](CommunityToolkit/dotnet@v8.3.2...v8.4.0)

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: CommunityToolkit.Mvvm
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dev-dependencies
...

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

examples/MAUI/MAUI.csproj

@@ -63,7 +63,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="CommunityToolkit.Maui" Version="9.1.1" />
-		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.3.2" />
+		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.4.0" />
 		<PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" Version="9.0.0" />
 		<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
 		<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />

tests/VoicevoxCoreSharp.Core.Tests/VoicevoxCoreSharp.Core.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="Microsoft.ML.OnnxRuntime" Version="$(VoicevoxOnnxRuntimeVersion)" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <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>