Bump xunit from 2.4.0 to 2.9.2

Bumps [xunit](https://github.com/xunit/xunit) from 2.4.0 to 2.9.2.
- [Commits](xunit/xunit@v2-2.4...v2-2.9.2)

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

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

Libplanet.Headless.Tests/Libplanet.Headless.Tests.csproj

@@ -20,7 +20,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
     <PackageReference Include="coverlet.collector" Version="1.3.0" />
   </ItemGroup>

NineChronicles.Headless.Executable.Tests/NineChronicles.Headless.Executable.Tests.csproj

@@ -13,7 +13,7 @@
     <ItemGroup>
         <PackageReference Include="Grpc.Core" Version="2.43.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-        <PackageReference Include="xunit" Version="2.4.0" />
+        <PackageReference Include="xunit" Version="2.9.2" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
         <PackageReference Include="coverlet.collector" Version="1.2.0" />
         <PackageReference Include="MagicOnion.Client" Version="6.1.3" />