chore(deps): update dependency xunit to 2.9.3

Author: renovate[bot]

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

@@ -9,7 +9,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
-    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.*">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>