Increase minimum Flutter app target iOS version from 9.0 to 11.0 flutter.dev/go/rfc-32-bit-ios-unsupported.

This should update apps, modules, and plugin example apps.

Last done in 8->9
Template: #60035 / #62902
Auto-migration: #85173 / #85174

Note this does not track updating plugins minimum version, which will require a new Flutter version constraints as done in #89695