I cannot upgrade flutter_lints to 3.0.0 because timer_countdown depends on 2.0 version.
Resolving dependencies...
Because <myapp> depends on flutter_timer_countdown ^1.0.5 which depends on flutter_lints ^2.0.0, flutter_lints ^2.0.0 is required.
So, because <myapp> depends on flutter_lints ^3.0.0, version solving failed.
You can try one of the following suggestions to make the pubspec resolve:
* Consider downgrading your constraint on flutter_timer_countdown: flutter pub add flutter_timer_countdown:^1.0.3
* Consider downgrading your constraint on flutter_lints: flutter pub add dev:flutter_lints:^2.0.3
exit code 1
I cannot upgrade flutter_lints to 3.0.0 because timer_countdown depends on 2.0 version.