Bump xunit.v3 to 3.2.1

Author: renovate[bot]

tests/Prometheus.Client.HttpClient.Tests/Prometheus.Client.HttpClient.Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="FluentAssertions" Version="8.8.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
-    <PackageReference Include="xunit.v3" Version="3.2.0" />
+    <PackageReference Include="xunit.v3" Version="3.2.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>