Bump System.Text.Json in /ManagedCode.Communication.Tests

Bumps System.Text.Json from 8.0.3 to 8.0.4.

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ManagedCode.Communication.Tests/ManagedCode.Communication.Tests.csproj

@@ -28,7 +28,7 @@
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-        <PackageReference Include="System.Text.Json" Version="8.0.3" />
+        <PackageReference Include="System.Text.Json" Version="8.0.4" />
         <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.6" />
         <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.6" />
         <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="8.0.6" />