chore(deps): update xunit-dotnet monorepo to v2.8.1

Author: renovate[bot]

tests/Prometheus.Client.DependencyInjection.Tests.csproj

@@ -19,12 +19,12 @@
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="6.0.1" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
   </ItemGroup>
   <ItemGroup>
@@ -36,7 +36,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit" Version="2.8.0" />
+    <PackageReference Include="xunit" Version="2.8.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\src\Prometheus.Client.DependencyInjection.csproj" />