Because firebase_storage ^8.1.3
depends on firebase_storage_web ^1.1.2
which depends on http ^0.13.0
, firebase_storage ^8.1.3
requires http ^0.13.0.
And because flutter_dialogflow >=0.1.3 depends on http ^0.12.0+2, firebase_storage ^8.1.3 is incompatible with flutter_dialogflow >=0.1.3.
So, because lily depends on both flutter_dialogflow ^0.1.3 and firebase_storage ^8.1.3, version solving failed.
pub finished with exit code 1
Try to remove versions numbers from each package and run flutter pub get
to make the package manager resolve this conflict and get only compatible versions of this packages.