chore(deps): update xunit-dotnet monorepo (#110)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://github.com/xunit/xunit) | `2.6.3` -> `2.6.4` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit/2.6.3/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit/2.6.3/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
| `2.5.5` -> `2.5.6` |
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>xunit/xunit (xunit)</summary>

### [`v2.6.4`](https://github.com/xunit/xunit/compare/2.6.3...2.6.4)

[Compare Source](https://github.com/xunit/xunit/compare/2.6.3...2.6.4)

</details>

<details>
<summary>xunit/visualstudio.xunit (xunit.runner.visualstudio)</summary>

###
[`v2.5.6`](https://github.com/xunit/visualstudio.xunit/compare/2.5.5...2.5.6)

[Compare
Source](https://github.com/xunit/visualstudio.xunit/compare/2.5.5...2.5.6)

</details>

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Tests/Directory.Build.props

@@ -26,8 +26,8 @@
 		<PackageReference Include="FluentAssertions" Version="6.12.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
 		<PackageReference Include="Xunit.SkippableFact" Version="1.4.*" />
-		<PackageReference Include="xunit" Version="2.6.3" />
-		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.5">
+		<PackageReference Include="xunit" Version="2.6.4" />
+		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>
 		</PackageReference>