Flutter Matka App Update

I already have the complete Flutter codebase for my online Matka app; it simply needs a refresh.
Your tasks are straightforward:

• Repoint the base URL so every call now targets a different API endpoint.
• Remove or upgrade any deprecated packages and migrate the project to the latest stable Flutter version.

Once those adjustments are in place, compile a clean, release-ready build. I expect the updated source (pushed back to my repo) and a signed APK; an iOS build is a bonus if you have the setup.

Please ensure the app runs without warnings after flutter analyze, all existing features remain intact, and you provide a concise changelog describing the edits.