fix "version solving failed" error when running "flutter build" from polygonid-flutter-wrapper directory
remove unused imports
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[✓] Flutter (Channel stable, 3.19.3, on macOS 14.4.1 23E224 darwin-arm64, locale
en-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
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❯ flutter build ios-framework
Building frameworks for technology.polygon.polygonidFlutterWrapper in debug mode...
├─Copying Flutter.xcframework... 190ms
├─Building App.xcframework... 5.2s
├─Building plugins... 23.5s
└─Moving to build/ios/framework/Debug 238ms
Building frameworks for technology.polygon.polygonidFlutterWrapper in profile mode...
├─Copying Flutter.xcframework... 124ms
├─Building App.xcframework... 14.8s
├─Building plugins... 32.5s
└─Moving to build/ios/framework/Profile 178ms
Building frameworks for technology.polygon.polygonidFlutterWrapper in release mode...
├─Copying Flutter.xcframework... 146ms
├─Building App.xcframework... 11.8s
├─Building plugins... 28.9s
└─Moving to build/ios/framework/Release 186ms
Frameworks written to /Users/yushihang/Documents/polygonID/polygonid-flutter-sdk_pr/polygonid-flutter-wrapper/build/ios/framework.
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