Bump xunit from 2.5.2 to 2.5.3 (#95)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.2 to 2.5.3.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/xunit/commit/161ce40d656a92fe3dda826a98c742310c7c55a1"><code>161ce40</code></a>
v2.5.3</li>
<li><a
href="https://github.com/xunit/xunit/commit/b8bfb82f89ea697d7b5c7961100b61bc0bd82ff6"><code>b8bfb82</code></a>
<a href="https://redirect.github.com/xunit/xunit/issues/2795">#2795</a>:
Collection equality regression with custom comparer on sequence type
(...</li>
<li><a
href="https://github.com/xunit/xunit/commit/644d65e557a398317d54b6228abf2b79b887c12d"><code>644d65e</code></a>
Use <code>is null</code> and <code>is not null</code> in assertion
tests</li>
<li><a
href="https://github.com/xunit/xunit/commit/2457cf147e0dca6e34a15a43ada9298201005b93"><code>2457cf1</code></a>
Bump up to v2.5.3-pre</li>
<li>See full diff in <a
href="https://github.com/xunit/xunit/compare/2.5.2...2.5.3">compare
view</a></li>
</ul>
</details>
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IntelliTect.Multitool.Tests/IntelliTect.Multitool.Tests.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.20.69" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="xunit" Version="2.5.2" />
+    <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>