Bump xunit from 2.9.1 to 2.9.2 in /src

Bumps [xunit](https://github.com/xunit/xunit) from 2.9.1 to 2.9.2.
- [Commits](xunit/xunit@2.9.1...2.9.2)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Mattox.NServiceBus.Tests/Mattox.NServiceBus.Tests.csproj

@@ -15,7 +15,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1"/>
-        <PackageReference Include="xunit" Version="2.9.1"/>
+        <PackageReference Include="xunit" Version="2.9.2"/>
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>