doesn't work in flutter >3.20

[nashihu]

i'm using flutter 3.2.2 and got this error:

The current Dart SDK version is 3.4.0.

Because no versions of cell_info match >0.2.9 <0.3.0 and cell_info 0.2.9
  depends on flare_flutter ^2.0.3, cell_info ^0.2.9 requires flare_flutter
  ^2.0.3.
So, because flare_flutter >=1.0.1 <3.0.0-nullsafety.0 doesn't support null
  safety and anonvacy depends on cell_info ^0.2.9, version solving failed.

The lower bound of "sdk: '>=2.0.0-dev.58.0 <3.0.0'" must be 2.12.0 or higher to enable null safety.
For details, see https://dart.dev/null-safety