🫡

This was terribly outdated and has long been superseded by `package:flutter_lints`. Also, as of https://github.com/dart-lang/sdk/commit/c033718da0502ed92609f8c6cee2f6a59ccc058e support for this was removed from the analyzer and this file is now even more useless, if that's even possible.

Fixes https://github.com/flutter/flutter/issues/82948.