Bump xunit from 2.9.0 to 2.9.1 in the xunit group (#119)

Bumps the xunit group with 1 update: [xunit](https://github.com/xunit/xunit).


Updates `xunit` from 2.9.0 to 2.9.1
- [Commits](xunit/xunit@2.9.0...2.9.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/GitReader.SourceGenerator.Tests/GitReader.SourceGenerator.Tests.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="System.Text.Json" Version="8.0.4" />
     <PackageReference Include="Verify.XUnit" Version="26.6.0" />
     <PackageReference Include="Verify.SourceGenerators" Version="2.5.0" />
-    <PackageReference Include="xunit" Version="2.9.0" />
+    <PackageReference Include="xunit" Version="2.9.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>