Bump System.Text.Json from 8.0.5 to 9.0.0 (#745)

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 8.0.5 to 9.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.5...v9.0.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -71,7 +71,7 @@
     <PackageVersion Include="Slack.Webhooks" Version="1.1.5" />
     <PackageVersion Include="Spectre.Console" Version="0.49.1" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
-    <PackageVersion Include="System.Text.Json" Version="8.0.5" />
+    <PackageVersion Include="System.Text.Json" Version="9.0.0" />
     <PackageVersion Include="TUnit" Version="0.3.20" />
     <PackageVersion Include="TUnit.Assertions" Version="0.3.20" />
     <PackageVersion Include="TUnit.Core" Version="0.3.20" />