add firebase cli

ios/Podfile

@@ -1,5 +1,5 @@
 # Uncomment this line to define a global platform for your project
-# platform :ios, '9.0'
+# platform :ios, '12.0'
 
 # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
 ENV['COCOAPODS_DISABLE_STATS'] = 'true'
@@ -36,4 +36,4 @@ post_install do |installer|
     flutter_additional_ios_build_settings(target)
   end
 end
-use_frameworks!
+use_frameworks!