Revert https://github.com/openfoodfacts/smooth-app/pull/3666

[teolemon]

What

• Revert feat: 3585 - upgrade to flutter 3.7 #3666 so that we can release Packagings weights not recorded if using a comma (6,5) or a unit (e.g. 6.9 g) is included (mobile) #3663 with a working scanner
• Another option is a hotfix for Packagings weights not recorded if using a comma (6,5) or a unit (e.g. 6.9 g) is included (mobile) #3663

[stephanegigandet]

To give some context: the revamp of the scan is very important topic (probably the most important topic of the app), so we should not rush it just because the Flutter upgrade broke the scanner.

Reverting the upgrade to Flutter so that we have a working app (without the bug #3670), on which we can add and deploy fixes and improvements (such as #3663), will give us time to explore solutions (such as #3694 proposed by @monsieurtanuki), to make the right choices and to create a great scanning experience.

[monsieurtanuki]

I've just PR'ed #3702.

The priority now should probably be to fix the MLKit part so that it works on flutter 3.7.

[teolemon]

Thank you very much @monsieurtanuki 🙏