Error in Flutter unknown Error in iOS build, occurred after Flutter 2 and XCode 12.5 update

My pod file looks like this and works perfectly

# Uncomment this line to define a global platform for your project
platform :ios, '12'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

post_install do |installer|
 installer.pods_project.targets.each do |target|
   flutter_additional_ios_build_settings(target)
   target.build_configurations.each do |config|
     config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '10.3'
     config.build_settings['ENABLE_BITCODE'] = 'YES'
     config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
             '$(inherited)',
     # dart: PermissionGroup.camera
     'PERMISSION_CAMERA=1',

     # dart: PermissionGroup.microphone
     'PERMISSION_MICROPHONE=1',

     # dart: PermissionGroup.photos
     'PERMISSION_PHOTOS=1',

     # dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
     'PERMISSION_LOCATION=1',

     # dart: PermissionGroup.notification
     'PERMISSION_NOTIFICATIONS=1',

     ]
   end
   installer.pods_project.build_configurations.each do |config|
       config.build_settings["EXCLUDED_ARCHS[sdk=iphonesimulator*]"] = "arm64"
   end
 end
end


# target 'ImageNotification' do
#   use_frameworks!
#
#   pod 'Firebase/Messaging'
# end