Description:

When building with Flutter 3.35.3 (stable) and Xcode 15+, App Store Connect rejects archives with the following error:

Invalid Bundle. The bundle Runner.app/Frameworks/App.framework does not support the minimum OS Version specified in the Info.plist.

Steps to reproduce:

1. Create a new Flutter app with Flutter 3.35.3
2. Set iOS Deployment Target in Xcode Runner target to 16.0 (the lowest selectable in Xcode 15)
3. Build for release:
   flutter build ios --release
4. Inspect the generated framework:
   otool -l build/ios/Release-iphoneos/Runner.app/Frameworks/App.framework/App | grep -A 3 LC_BUILD_VERSION

Observed output:

cmd LC_BUILD_VERSION
   platform iOS
   minos 13.0
   sdk 18.0

Expected output:

minos 15.0 (or higher, matching the app’s deployment target)

Notes:

• Firebase iOS SDKs now require iOS ≥15.0.
• Xcode 15 no longer allows setting a deployment target below 15.0.
• This results in an unavoidable mismatch: Runner target ≧15 vs App.framework 13.0.
• Apple rejects the archive.

Workarounds tried:

• Cleaning, re-running flutter precache --ios --force, rebuilding → still 13.0.
• Manually patching AppFrameworkInfo.plist inside the archive lets the upload pass, but this is not sustainable.

Request:
Please update the iOS engine build configs so that App.framework is built with --minimum_ios_version=15.0 (or higher) to align with Apple’s toolchain and Firebase’s requirements.