chore(deps): bump System.Text.Json in /src/messaging/dotnet/src/Core

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 8.0.4 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.4...v9.0.0)

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -47,13 +47,13 @@
     <PackageVersion Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     <PackageVersion Include="System.Diagnostics.PerformanceCounter" Version="8.0.0" />
     <PackageVersion Include="System.Drawing.Common" Version="8.0.10" />
-    <PackageVersion Include="System.IO.Pipelines" Version="8.0.0" />
+    <PackageVersion Include="System.IO.Pipelines" Version="9.0.0" />
     <PackageVersion Include="System.Management" Version="8.0.0" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Reactive.Async" Version="6.0.0-alpha.18" />
     <PackageVersion Include="System.Reactive" Version="6.0.1" />
     <PackageVersion Include="System.ServiceModel.Primitives" Version="6.2.0" />
-    <PackageVersion Include="System.Text.Json" Version="8.0.4" />
+    <PackageVersion Include="System.Text.Json" Version="9.0.0" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions.Wrappers" Version="21.1.3" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions" Version="21.1.3" />
     <PackageVersion Include="Testably.Abstractions.Testing" Version="2.4.1" />