update intl to 0.18.0

[pelumibabs]

[devfolorunso]

@pelumibabs do you know if there is any update on this?

For context.

Flutter apps that depends on flutter_paystack are not able to use flutter_localizations from flutter sdk simply because flutter_localizations depends on intl 0.18.0

Please treat as urgent!

[pelumibabs]

@devfolorunso I understand that there's been no update on the issue yet. The best course of action would be to add a dependency override for 'intl'.

I've attached a screenshot as an example, though I'm not certain how sustainable it will be for your project.