chore(deps): update xunit-dotnet monorepo (#38)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://github.com/xunit/xunit) | `2.7.0` -> `2.7.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit/2.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit/2.7.0/2.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit/2.7.0/2.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
| `2.5.7` -> `2.5.8` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit.runner.visualstudio/2.5.8?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
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|

---

### Release Notes

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

### [`v2.7.1`](https://github.com/xunit/xunit/compare/2.7.0...2.7.1)

[Compare Source](https://github.com/xunit/xunit/compare/2.7.0...2.7.1)

</details>

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

###
[`v2.5.8`](https://github.com/xunit/visualstudio.xunit/compare/2.5.7...2.5.8)

[Compare
Source](https://github.com/xunit/visualstudio.xunit/compare/2.5.7...2.5.8)

</details>

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Server.Tests/Server.Tests.csproj

@@ -14,8 +14,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageReference Include="xunit" Version="2.7.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7" />
+    <PackageReference Include="xunit" Version="2.7.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" />
     <PackageReference Include="Snapshooter.Xunit" Version="0.13.0" />
   </ItemGroup>