Bump xunit.runner.visualstudio from 2.8.0 to 2.8.1 (#1961)

Bumps
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
from 2.8.0 to 2.8.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/ce9211e9707372687c3266984a0950f6206b4896"><code>ce9211e</code></a>
v2.8.1</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/3656cb8908b70944c230439c1e879645d2fce05e"><code>3656cb8</code></a>
Use 'dotnet format' instead of 'dotnet dotnet-format'</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/45eb7838531b6b94ee30c823ea59be48c483da6c"><code>45eb783</code></a>
Pull in output printing bug fix from core</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/e2052445d878aaf8c6b2bed7437d1c990447e7a4"><code>e205244</code></a>
<a
href="https://redirect.github.com/xunit/visualstudio.xunit/issues/408">#408</a>:
Add ability to print live output messages</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/06087e36a22182f5e44e508aaff4a25e3fa329e7"><code>06087e3</code></a>
Latest actions versions</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/075f3ff1a580c193b102914506ef3e976c08901d"><code>075f3ff</code></a>
Bump up to 2.8.1-pre</li>
<li>See full diff in <a
href="https://github.com/xunit/visualstudio.xunit/compare/2.8.0...2.8.1">compare
view</a></li>
</ul>
</details>
<br />


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ImperatorToCK3.UnitTests/ImperatorToCK3.UnitTests.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="xunit" Version="2.8.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>