Fix deprecation warnings in PhoneAuthUI

[paulb777]

After updating to iOS 13 minimum, several deprecations warnings show up. Fix the deprecations and remove the --allow-warnings from the phoneauth.yml pod job.

• WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:303:41: warning: 'statusBarFrame' is deprecated: first deprecated in iOS 13.0 - Use the statusBarManager property of the window scene instead. [-Wdeprecated-declarations]
  • NOTE | xcodebuild: /Applications/Xcode_15.0.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIApplication.h:131:38: note: 'statusBarFrame' has been explicitly marked deprecated here
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:307:11: warning: 'beginAnimations:context:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • NOTE | xcodebuild: /Applications/Xcode_15.0.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h:655:1: note: 'beginAnimations:context:' has been explicitly marked deprecated here
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:310:11: warning: 'setAnimationDuration:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • NOTE | xcodebuild: /Applications/Xcode_15.0.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h:660:1: note: 'setAnimationDuration:' has been explicitly marked deprecated here
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:311:11: warning: 'setAnimationCurve:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • NOTE | xcodebuild: /Applications/Xcode_15.0.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h:663:1: note: 'setAnimationCurve:' has been explicitly marked deprecated here
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:318:11: warning: 'commitAnimations' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • NOTE | xcodebuild: /Applications/Xcode_15.0.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h:656:1: note: 'commitAnimations' has been explicitly marked deprecated here
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:324:41: warning: 'statusBarFrame' is deprecated: first deprecated in iOS 13.0 - Use the statusBarManager property of the window scene instead. [-Wdeprecated-declarations]
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:327:11: warning: 'beginAnimations:context:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:330:11: warning: 'setAnimationDuration:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:331:11: warning: 'setAnimationCurve:' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]
  • WARN | xcodebuild: /Users/runner/work/FirebaseUI-iOS/FirebaseUI-iOS/FirebasePhoneAuthUI/Sources/FUIPhoneVerificationViewController.m:336:11: warning: 'commitAnimations' is deprecated: first deprecated in iOS 13.0 - Use the block-based animation API instead [-Wdeprecated-declarations]