[BUG][Dart] Getting Map<String, Object> instead of Map<String, dynamic>

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

I want to generate Map<String, dynamic> type but I'm getting Map<String, Object> instead. I'm talking about the initMap property in lib/models/device.dart. If I understood this part of the specification correctly, free-form objects can be anything (numbers, strings etc.) so the Object type is not correct. If I misunderstood it, is it possible to have dynamic type generated? Or why it is not? Thank you

openapi-generator version

Latest v6.6.0 .jar snapshot

OpenAPI declaration file content or url

Here is a gist: https://gist.github.com/Liniik/dca95f3a72e46f9d17544b312a2545aa

Generation Details

I'm using this command to generate the API: java -jar .\openapi-generator-cli-6.6.0-20230510.062557-69.jar generate -i .\openapi.yaml -g dart -o ./api

Steps to reproduce

From the given specification in the gist above, generate files via command in the paragraph above.

Related issues/PRs

Maybe #12165 could be somewhat related to it. But it was resolved so I don't know...

Reproduce the issue with the linked OpenAPI declaration and the documented Java generation command, then inspect the generated lib/models/device.dart file and its initMap property. Trace the Dart generator or template that determines this map value type and verify the result against the OpenAPI free-form object semantics. Done means the generated type matches the intended dynamic map type and relevant generation tests pass.