I currently have hazzled with this in my Flutter project.
In my project the FMDB was linking to version 8.0, so I suggest you try to force everything to a certain version.
Add these lines at the end of your Podfile:
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'] = '13.0'
end
end
end
I take no credits for this, it was an stackoverflow page that helped me out. Hopefully it will work for you :)