Bump xunit from 2.6.6 to 2.9.0

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.6 to 2.9.0.
- [Commits](xunit/xunit@2.6.6...2.9.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -15,7 +15,7 @@
     <PackageVersion Include="System.IO.Packaging" Version="6.0.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageVersion Include="xunit" Version="2.6.6" />
+    <PackageVersion Include="xunit" Version="2.9.0" />
     <!-- pinned dependencies required to test out-of-support target frameworks -->
     <PackageVersion Include="xunit.runner.visualstudio" Version="[2.4.5]" />
   </ItemGroup>