Bump xunit from 2.4.2 to 2.9.3

---
updated-dependencies:
- dependency-name: xunit
  dependency-version: 2.9.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Float.HttpServer.Tests/Float.HttpServer.Tests.csproj

@@ -15,7 +15,7 @@
     </PackageReference>
   </ItemGroup>
   <ItemGroup Condition="$(TargetFramework.StartsWith('netcoreapp'))">
-    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>