Update and Republish Flutter App

I need an existing Flutter app updated and republished on the Play Store. The app was working fine but was removed due to non-update.

Requirements:
- Update the app's code to the latest version.
- Ensure compatibility with current Play Store requirements.
- Reupload the app to the Play Store.

Ideal Skills:
- Proven experience with Flutter development.
- Familiarity with Play Store publication process.
- Ability to update and troubleshoot existing code.