chore(deps): update dependency xunit to 2.9.1 (#144)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://redirect.github.com/xunit/xunit) | `2.9.0` -> `2.9.1`
|
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit/2.9.0/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit/2.9.0/2.9.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v2.9.1`](https://redirect.github.com/xunit/xunit/compare/2.9.0...2.9.1)

[Compare
Source](https://redirect.github.com/xunit/xunit/compare/2.9.0...2.9.1)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/Testably/Testably.Architecture.Rules).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC44MC4wIiwidXBkYXRlZEluVmVyIjoiMzguODAuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Tests/Directory.Build.props

@@ -26,7 +26,7 @@
 		<PackageReference Include="FluentAssertions" Version="6.12.1" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
 		<PackageReference Include="Xunit.SkippableFact" Version="1.4.*" />
-		<PackageReference Include="xunit" Version="2.9.0" />
+		<PackageReference Include="xunit" Version="2.9.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>