Bump the nuget group with 2 updates

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


Updates `xunit` from 2.8.1 to 2.9.0
- [Commits](xunit/xunit@2.8.1...2.9.0)

Updates `xunit.runner.visualstudio` from 2.8.1 to 2.8.2
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.8.1...2.8.2)

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

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

CliWrap.Tests/CliWrap.Tests.csproj

@@ -17,8 +17,8 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="PolyShim" Version="1.12.0" PrivateAssets="all" />
     <PackageReference Include="System.Reactive" Version="6.0.1" />
-    <PackageReference Include="xunit" Version="2.8.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" PrivateAssets="all" />
+    <PackageReference Include="xunit" Version="2.9.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" PrivateAssets="all" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
   </ItemGroup>