Kindly update http to latest

[olofumark]

Because flutter_paystack 1.0.7 depends on http ^0.13.5 and no versions of flutter_paystack match >1.0.7 <2.0.0, flutter_paystack ^1.0.7 requires http ^0.13.5.
So, because kitu_local_common_ui_package depends on both http ^1.0.0 and flutter_paystack ^1.0.7, version solving failed.

looking forward!. thanks