build(deps): bump xunit from 2.6.6 to 2.7.0

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.6 to 2.7.0.
- [Commits](xunit/xunit@2.6.6...2.7.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Directory.Packages.props

@@ -18,7 +18,7 @@
     <PackageVersion Include="NSubstitute" Version="5.1.0" />
     <PackageVersion Include="NSubstitute.Analyzers.CSharp" Version="1.0.16" PrivateAssets="all" />
     <PackageVersion Include="XmlDiffPatch.Core" Version="1.0.1" />
-    <PackageVersion Include="xunit" Version="2.6.6" />
+    <PackageVersion Include="xunit" Version="2.7.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" PrivateAssets="all" />
   </ItemGroup>