chore(deps): update xunit-dotnet monorepo to v2.8.0

Author: renovate[bot]

tests/Prometheus.Client.MetricPusher.HostedService.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <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="coverlet.collector" Version="6.0.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
@@ -28,7 +28,7 @@
     </PackageReference>
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0' Or '$(TargetFramework)' == 'net7.0'">
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>