⬆️ Update 🥅 .NET Package xunit to v2.6.0 (#106)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://togithub.com/xunit/xunit) | `2.5.3` -> `2.6.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit/2.5.3/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit/2.5.3/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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Directory.Packages.props

@@ -10,7 +10,7 @@
     <PackageVersion Include="codecov.msbuild" Version="1.13.0" developmentDependency="true" />
     <PackageVersion Include="coverlet.collector" Version="6.0.0" developmentDependency="true" />
     <PackageVersion Include="coverlet.msbuild" Version="6.0.0" developmentDependency="true" />
-    <PackageVersion Include="xunit" Version="2.5.3" developmentDependency="true" />
+    <PackageVersion Include="xunit" Version="2.6.0" developmentDependency="true" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.3" developmentDependency="true" />
   </ItemGroup>
 </Project>