Fix Warnings whily Xcode-Releasing

[holger-dev]

Runner
The app icon set "AppIcon" has 6 unassigned children.

AppDelegate.swift:16:34 'url' was deprecated in iOS 26.0: Use UIScene lifecycle and UIScene.ConnectionOptions.URLContexts instead.

AppDelegate.swift:72:29 'OpenURLOptionsKey' was deprecated in iOS 26.0: Use UIScene lifecycle and equivalent properties on UISceneOpenURLOptions from a UIOpenURLContext in UIScene.ConnectionOptions.URLContexts instead.

file_picker
FilePickerPlugin.m:410:17 Incompatible pointer types assigning to 'NSMutableArray<NSURL *> *' from 'NSArray<NSURL *> *'

FilePickerUtils.m:133:30 Unused variable 'exportError'