updated dependencies and webview code

[MrUnfunny]

Hey @jacksonjude, I was looking to integrate CloudKit in android and your package works perfectly. Just needed to update some dependencies. Please take a look.

[jacksonjude]

Hi @MrUnfunny! Most of the dependency bumps look good to me, but I'm just curious about the ck_auth_web_view.dart changes. May I ask why a major version upgrade is needed for webview_flutter?

[MrUnfunny]

I updated webview_flutter because I'm already using it in my project and it's creating a conflict with this package. The newer version of webview_flutter includes some breaking changes, that's why it was necessary to update ck_auth_web_view.dart.