Fix flutter installation on Mac

Need to fix some issues and get clean environment: flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 2.8.1, on Mac OS X 10.13.6 17G14042 darwin-x64, locale ar-SA) [!] Android toolchain - develop for Android devices (Android SDK version 28.0.3) ✗ Flutter requires Android SDK 29 and the Android BuildTools 28.0.3 To update the Android SDK visit [login to view URL] for detailed instructions. [!] Xcode - develop for iOS and macOS ✗ Xcode installation is incomplete; a full installation is necessary for iOS development. Download at: [login to view URL] Or install Xcode via the App Store. Once installed, run: sudo xcode-select --switch /Applications/[login to view URL] sudo xcodebuild -runFirstLaunch ! CocoaPods 1.5.3 out of date (1.10.0 is recommended). CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that responds to your plugin usage on the Dart side. Without CocoaPods, plugins will not work on iOS or macOS. For more info, see [login to view URL] To upgrade see [login to view URL] for instructions. [✓] Chrome - develop for the web [✓] Android Studio (version 2021.1) [✓] VS Code (version 1.40.0) [✓] VS Code (version 1.52.1) [✓] Connected device (2 available)