Bump xunit from 2.5.3 to 2.6.0 (#133)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.3 to 2.6.0.
- [Commits](xunit/xunit@2.5.3...2.6.0)

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

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

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="MSBuild.StructuredLogger" Version="2.1.858" />
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.6.133" />
     <PackageVersion Include="Unquote" Version="6.1.0" />
-    <PackageVersion Include="xunit" Version="2.5.3" />
+    <PackageVersion Include="xunit" Version="2.6.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.3" />
   </ItemGroup>
 </Project>