Upgrade http dependency to 1.x

[gustav3d]

Upgrade to http plugin to 1.0 and hence migration to Dart 3.0

[abhinovpankaj]

Any plans upgrading to latest http package?

[Carapacik]

Updated https://pub.dev/packages/flutter_cache_manager/versions/3.3.1

[mvanbeusekom]

Closing this issue as the dependency has been updated per version 3.3.1