Bump xunit from 2.6.4 to 2.6.5 (#111)

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.4 to 2.6.5.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/xunit/commit/7f8276500af528de2a9011f9a32625046bdf5e4a"><code>7f82765</code></a>
v2.6.5</li>
<li><a
href="https://github.com/xunit/xunit/commit/98f19ddd6d072b695bacec42854332871a3762d4"><code>98f19dd</code></a>
Updated tests (for analyzer exclusions)</li>
<li><a
href="https://github.com/xunit/xunit/commit/298b1b13d3bea59daeb33d15e3e3cad45a4dd744"><code>298b1b1</code></a>
<a href="https://redirect.github.com/xunit/xunit/issues/2854">#2854</a>:
Add constructors and AddRange for TheoryData&lt;T&gt;</li>
<li><a
href="https://github.com/xunit/xunit/commit/36fe729c871ab563781f671e9ab1014515732a87"><code>36fe729</code></a>
Bump up to v2.6.5-pre</li>
<li>See full diff in <a
href="https://github.com/xunit/xunit/compare/2.6.4...2.6.5">compare
view</a></li>
</ul>
</details>
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Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     <PackageVersion Include="Moq" Version="4.20.69" />
-    <PackageVersion Include="xunit" Version="2.6.4" />
+    <PackageVersion Include="xunit" Version="2.6.5" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 </Project>