build(deps): Bump xunit from 2.5.0 to 2.5.1

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.0 to 2.5.1.
- [Commits](xunit/xunit@2.5.0...2.5.1)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

testing/ReactiveUI.Samples.Testing.SimpleViewModels.Tests/ReactiveUI.Samples.Testing.SimpleViewModelsUnitTests.csproj

@@ -1,11 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net7.0;net462</TargetFrameworks>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ReactiveUI.Testing" Version="$(ReactiveUIVersion)" />
-    <PackageReference Include="xunit" Version="2.5.0" />
+    <PackageReference Include="xunit" Version="2.5.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ReactiveUI.Samples.Testing.SimpleViewModels\ReactiveUI.Samples.Testing.SimpleViewModels.csproj" />