flutter_keyboard_visibility & intl dependencies upgrade

[f4bio]

to avoid breaking/overriding dependencies with of latest (0.19) intl package

[dJani97]

Thank you, I'll be using this in my project

[vasilich6107]

This package does not seem to be supported Just a friendly reminder to migrate

https://github.com/GiancarloCode/form_bloc/pull/312#issuecomment-1164240179