Bump System.Text.Json from 8.0.5 to 9.0.0

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
...

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

Author: dependabot[bot]

Agent/Agent.csproj

@@ -25,7 +25,7 @@
 		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0"/>
 		<PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.2"/>
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all"/>
-		<PackageReference Include="System.Text.Json" Version="8.0.5"/>
+		<PackageReference Include="System.Text.Json" Version="9.0.0"/>
 		<None Include="../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="."/>
 	</ItemGroup>