Fix iOS build "ImagePickerManager.h:32:43: No type or protocol named 'RNImagePickerSpec'"

[retyui]

Thanks for submitting a PR! Please read these instructions carefully:

• Explain the motivation for making this change.
• Provide a test plan demonstrating that the code is solid.
• Match the code formatting of the rest of the codebase.
• Target the main branch, NOT a "stable" branch.

Motivation (required)

I can't build RN app with NEW_ARCH enabled

Test Plan (required)

npx react-native init Rn73
cd Rn73
yarn add react-native-image-picker
NO_FLIPPER=1 RCT_NEW_ARCH_ENABLED=1 npx pod-install
yarn ios
# ^^^ ImagePickerManager.h:32:43: No type or protocol named 'RNImagePickerSpec'

[retyui]

cc @Johan-dutoit

[gabrieldonadel]

Fixed here #2252