chore(deps): update xunit-dotnet monorepo to v2.8.1 (open-feature#266)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [xunit](https://togithub.com/xunit/xunit) | `2.7.1` -> `2.8.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit/2.7.1/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit/2.7.1/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[xunit.runner.visualstudio](https://togithub.com/xunit/visualstudio.xunit)
| `2.5.8` -> `2.8.1` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/xunit.runner.visualstudio/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/xunit.runner.visualstudio/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/xunit.runner.visualstudio/2.5.8/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/xunit.runner.visualstudio/2.5.8/2.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

### [`v2.8.1`](https://togithub.com/xunit/xunit/compare/2.8.0...2.8.1)

[Compare Source](https://togithub.com/xunit/xunit/compare/2.8.0...2.8.1)

### [`v2.8.0`](https://togithub.com/xunit/xunit/compare/2.7.1...2.8.0)

[Compare Source](https://togithub.com/xunit/xunit/compare/2.7.1...2.8.0)

</details>

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

###
[`v2.8.1`](https://togithub.com/xunit/visualstudio.xunit/compare/2.8.0...2.8.1)

[Compare
Source](https://togithub.com/xunit/visualstudio.xunit/compare/2.8.0...2.8.1)

###
[`v2.8.0`](https://togithub.com/xunit/visualstudio.xunit/compare/2.5.8...2.8.0)

[Compare
Source](https://togithub.com/xunit/visualstudio.xunit/compare/2.5.8...2.8.0)

</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 these
updates again.

---

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

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/open-feature/dotnet-sdk).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4zMjEuMiIsInVwZGF0ZWRJblZlciI6IjM3LjM2OC4xMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Signed-off-by: Artyom Tonoyan <[email protected]>

Author: renovate[bot]

Directory.Packages.props

@@ -24,8 +24,8 @@
     <PackageVersion Include="SpecFlow" Version="3.9.74" />
     <PackageVersion Include="SpecFlow.Tools.MsBuild.Generation" Version="3.9.74" />
     <PackageVersion Include="SpecFlow.xUnit" Version="3.9.74" />
-    <PackageVersion Include="xunit" Version="2.7.1" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.8" />
+    <PackageVersion Include="xunit" Version="2.8.1" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.1" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(OS)' == 'Unix'">