build(deps): bump xunit.runner.visualstudio from 2.5.6 to 2.8.0

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.6 to 2.8.0.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.6...2.8.0)

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

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

Directory.Packages.props

@@ -19,7 +19,7 @@
     <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.runner.visualstudio" Version="2.5.6" PrivateAssets="all" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.0" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>