[Flutter] Flutter dart null safety

I am trying to install firebase_firestore flutter plugin but I am getting the following error:

flutter pub add firebase_firestore
The current Dart SDK version is 3.5.3.

Because mpolice depends on firebase_firestore any which doesn't support null safety, version solving failed.

The lower bound of "sdk: '>=1.8.0 <2.0.0-dev.infinity'" must be 2.12.0 or higher to enable null safety.
For details, see https://dart.dev/null-safety


My pubspec is the following:

name: mpolice
description: "Ap"
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

version: 1.0.0+1

environment:
sdk: '>=3.3.3 <4.0.0'

dependencies:
flutter:
sdk: flutter


# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^1.0.8
intl: ^0.19.0
flutter_riverpod: ^2.5.3
firebase_core: ^3.4.0
firebase_auth: ^5.2.0

dev_dependencies:
flutter_test:
sdk: flutter

flutter_lints: ^5.0.0


I am not being able to find this sdk range nowhere and my pubspec's lower bound is already higher than 2.19.0. WHere is this message coming from?

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