Error: The lower bound of "sdk: '>=2.7.0 <3.0.0'" must be 2.12.0' or higher to enable null safety

Help please.
I get the error in the title when trying to run the app.
My dart version is 3.0.3 and here is the content of the pubspec.yaml file:

version: 1.15.1+1
environment:
sdk: ">=2.12.0"
dependencies:
flutter:
sdk: flutter
flutter_bloc: ^7.3.1
equatable:
# Http
dio: ^4.0.0
pretty_dio_logger: ^1.1.1
jwt_decoder: ^2.0.0
# Database
floor: ^1.4.1
uuid: ^3.0.2
localstorage: ^4.0.0+1
# UI
avatar_glow: ^2.0.1
flutter_launcher_icons: ^0.9.0
image_picker: ^0.8.0
transparent_image: ^2.0.0
flutter_svg: ^0.22.0
lottie: ^1.1.0
fluttertoast: ^8.0.9
# Logger
logger: ^0.7.0+2
logger_flutter: ^0.7.1
get: ^4.6.5
permission_handler: ^8.0.0+2
audioplayers: ^0.20.0
rxdart: ^0.26.0
ota_update: ^4.0.2
package_info_plus: ^1.4.3
cached_network_image: ^3.2.3
dev_dependencies:
flutter_test:
sdk: flutter
bloc_test: ^8.0.0
mockito: ^5.3.2
floor_generator: ^1.2.0
build_runner: ^2.1.11
flutter_icons:
android: true
ios: true
image_path: "assets/png/icon_dit_jade.png"
flutter:
uses-material-design: true
assets:
- assets/
- assets/animated/
- assets/png/
fonts:
- family: OpenSans
fonts:
- asset: assets/fonts/OpenSans-Light.ttf
- asset: assets/fonts/OpenSans-SemiBold.ttf
weight: 600
- family: Ubuntu
fonts:
- asset: assets/fonts/Ubuntu-Regular.ttf
style: normal
- asset: assets/fonts/Ubuntu-Italic.ttf
style: italic

I tried migrating using the commands: dart pub outdated --node=null-safety and dart pub update --node=null-safety but I get the error
ERROR: "Because jadbot depends on logger_flutter >=0.7.0 which doesn't support null safety, version solving failed."

when trying to downgrade to dart version 2.19.0 I get the result of the attached screenshot

used dart fix --dry-run and dart fix --apply and tried running the app after but got this error:

[Update]: Downgrading the version of dart worked for me. Anyone who has the same issue should try matching versions, as it seemed to be the probem.