chore(deps): improve dependencies constraints for compatibility

[EchoEllet]

The versions listed in pubspec.yaml indicate the minimum required for dependencies
and do not affect those used in the client's application.
For more information, visit:

• https://dart.dev/tools/pub/dependencies#version-constraints
• https://docs.flutter.dev/packages-and-plugins/using-packages#conflict-resolution
• https://dart.dev/tools/pub/versioning
• https://dart.dev/guides/libraries/private-files#pubspec-lock
• https://dart.dev/tools/pub/pubspec#sdk-constraints

The pubspec.lock should be included only for application packages, which contain the used dependencies versions.
When the client runs flutter pub get they will get the latest compatible dependencies at the time until they run flutter pub upgrade. The flutter pub upgrade --major-versions updates the major versions in pubspec.yaml.

Changes

• Updates the package to not require Flutter SDK or Google material icons
• Updates flutter_lints to 5.0.0 and fix analysis warnings
• Updates minimum supported Dart SDK version From 3.4.3 to 3.0

Aditional Context

There is an analysis warning coming from unintended_html_in_doc_comment which will be enabled by default and part of the core set starting from 5.1.0. I ignored the warning to avoid additional changes.

This repo will probably need an example so contributors and CI can test against the latest dependencies (pubspec.lock included).

This PR fixes an issue on the Flutter Quill repo:

• Lower the minimum dependencies constraints for backward compatibility singerdmx/flutter-quill#2347

Details

Resolving dependencies...
The current Dart SDK version is 3.3.3.

Because flutter_quill >=10.6.1 depends on flutter_quill_delta_from_html >=1.1.5 which requires SDK version >=3.4.3 <4.0.0, flutter_quill >=10.6.1 is forbidden.
So, because su depends on flutter_quill 10.8.5, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Consider downgrading your constraint on flutter_quill: flutter pub add flutter_quill:^2.0.7
exit code 1