build(deps): bump Microsoft.Playwright and System.Text.Json

Bumps [Microsoft.Playwright](https://github.com/microsoft/playwright-dotnet) and [System.Text.Json](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `Microsoft.Playwright` from 1.49.0 to 1.50.0
- [Release notes](https://github.com/microsoft/playwright-dotnet/releases)
- [Commits](microsoft/playwright-dotnet@v1.49.0...v1.50.0)

Updates `System.Text.Json` from 9.0.1 to 9.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v9.0.1...v9.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Playwright
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="Jint" Version="4.2.0" />
     <PackageVersion Include="JsonSchema.Net" Version="7.2.3" />
     <PackageVersion Include="Markdig" Version="0.40.0" />
-    <PackageVersion Include="Microsoft.Playwright" Version="1.49.0" />
+    <PackageVersion Include="Microsoft.Playwright" Version="1.50.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="OneOf" Version="3.0.271" />
     <PackageVersion Include="OneOf.SourceGenerator" Version="3.0.271" />