Bump xunit from 2.7.1 to 2.8.0

Bumps [xunit](https://github.com/xunit/xunit) from 2.7.1 to 2.8.0.
- [Commits](xunit/xunit@2.7.1...2.8.0)

---
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]

test/GitHubLabelSync.Tests.csproj

@@ -7,7 +7,7 @@
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0"/>
 		<PackageReference Include="NSubstitute" Version="5.1.0"/>
-		<PackageReference Include="xunit" Version="2.7.1"/>
+		<PackageReference Include="xunit" Version="2.8.0"/>
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.8"/>
 		<PackageReference Include="coverlet.collector" Version="6.0.2" PrivateAssets="all"/>
 		<ProjectReference Include="../src/GitHubLabelSync.csproj"/>