Bump the xunit group with 2 updates

Bumps the xunit group with 2 updates: [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.7.1 to 2.8.0
- [Commits](xunit/xunit@2.7.1...2.8.0)

Updates `xunit.runner.visualstudio` from 2.5.7 to 2.8.0
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.7...2.8.0)

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

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

Directory.Packages.props

@@ -15,8 +15,8 @@
     <PackageVersion Include="Nerdbank.GitVersioning" Version="3.6.133" PrivateAssets="all" />
     <PackageVersion Include="Spectre.Console" Version="0.48.0" />
     <PackageVersion Include="Spectre.Console.Testing" Version="0.48.0" />
-    <PackageVersion Include="xunit" Version="2.7.1" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.7" PrivateAssets="all">
+    <PackageVersion Include="xunit" Version="2.8.0" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.0" PrivateAssets="all">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageVersion>
   </ItemGroup>