Bump xunit from 2.5.0 to 2.5.1 (#3326)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.0 to 2.5.1.
- [Commits](xunit/xunit@2.5.0...2.5.1)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.packages.props

@@ -23,7 +23,7 @@
     <PackageVersion Include="ShowMeTheXAML.MSBuild" Version="2.0.0" />
     <PackageVersion Include="VirtualizingWrapPanel" Version="1.5.7" />
     <PackageVersion Include="XAMLTest" Version="1.1.0" />
-    <PackageVersion Include="xunit" Version="2.5.0" />
+    <PackageVersion Include="xunit" Version="2.5.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.1" />
     <PackageVersion Include="Xunit.StaFact" Version="1.1.11" />
   </ItemGroup>