Bump iOS version example

[itaybre]

Fixes some of the issues when building with Cocoa v9

[buenaflor]

I think we can skip work on integrating Cocoa v9 for now, we won't be able to use it on Flutter anytime soon since it bumps the min iOS version

[denrase]

@buenaflor If the cocoa SDK bumps the iOS version, we should consider doing this sooner. But as this is a breaking change, you probably want to do this in a major version, right?

[buenaflor]

@denrase yea we don't wanna do this now, only in a new major