Bump xunit from 2.6.5 to 2.6.6 (#1708) #minor

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.5 to 2.6.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/xunit/commit/f03fe098d1577f6dd65055d9f65686c4def2f98a"><code>f03fe09</code></a>
v2.6.6</li>
<li><a
href="https://github.com/xunit/xunit/commit/280a0cbf6a4e1d11f4108fbe2b811abd4c9eab76"><code>280a0cb</code></a>
Update build to use .NET SDK 8 and C# 12 (<a
href="https://redirect.github.com/xunit/xunit/issues/2863">#2863</a>)</li>
<li><a
href="https://github.com/xunit/xunit/commit/fdf75ab641e91e3102f7f3791f6c3b4076ea0fe6"><code>fdf75ab</code></a>
<a href="https://redirect.github.com/xunit/xunit/issues/2334">#2334</a>:
Add assembly-level support for BeforeAfterTestAttribute (v2)</li>
<li><a
href="https://github.com/xunit/xunit/commit/ba06476db53b27a37e816b82bf2ba435929a9d29"><code>ba06476</code></a>
Add targetFramework for xunit.assert.nuspec</li>
<li><a
href="https://github.com/xunit/xunit/commit/9db7d3053ed3ceb8ca8e679fc08d211026637db0"><code>9db7d30</code></a>
Test out additional target framework dependencies in .nuspec files</li>
<li><a
href="https://github.com/xunit/xunit/commit/27e91e38a3cfd7a232ba48d900fc29d4ab1121ca"><code>27e91e3</code></a>
Bump up to 2.6.6-pre</li>
<li>See full diff in <a
href="https://github.com/xunit/xunit/compare/2.6.5...2.6.6">compare
view</a></li>
</ul>
</details>
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ImperatorToCK3.UnitTests/ImperatorToCK3.UnitTests.csproj

@@ -18,7 +18,7 @@
     </PackageReference>
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <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>