chore(deps): update dependency xunit to v2.6.6 (#33)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://togithub.com/xunit/xunit) | `2.6.5` -> `2.6.6` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.6.6?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>

### [`v2.6.6`](https://togithub.com/xunit/xunit/compare/2.6.5...2.6.6)

[Compare Source](https://togithub.com/xunit/xunit/compare/2.6.5...2.6.6)

</details>

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MumbleApi.Test/MumbleApi.Test.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-        <PackageReference Include="xunit" Version="2.6.5" />
+        <PackageReference Include="xunit" Version="2.6.6" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>