QuillEditor doesn't respect the system keyboard brightness by default on iOS

[EchoEllet]

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Flutter Quill Version

11.1.1

Steps to Reproduce

1. Run the example on an iOS device.
2. Open the settings and enable dark mode.
3. If on the simulator, make sure to show the soft keyboard instead of using the hardware keyboard of macOS. Use the Command + K keyboard shortcut or go to I/O > Keybaord > Toggle software keyboard when focusing on the iOS simulator window.
4. The keyboard appearance is light instead of dark, it's always light (the default is hardcoded).

Expected results

To respect the system's brightness by default.

Actual results

Doesn't respect the system's brightness. However QuillRawEditor worked as expected (

flutter-quill/lib/src/editor/raw_editor/config/raw_editor_config.dart

Line 55 in c0e624a

this.keyboardAppearance,

).

Additional Context

Screenshots / Video demonstration

For reference, see:

• https://github.com/flutter/flutter/blob/06b9f7ba0bef2b5b44a643c73f4295a096de1202/packages/flutter/lib/src/services/text_input.dart#L621-L626

• flutter-quill/lib/src/editor/raw_editor/config/raw_editor_config.dart

  Lines 312 to 327 in c0e624a

  	/// The appearance of the keyboard.
  	///
  	/// This setting is only honored on iOS devices.
  	///
  	/// Defaults to Material/Cupertino App Brightness.
  	///
  	/// The keyboardd appearance will set using the following:
  	///
  	/// ```dart
  	/// widget.configurations.keyboardAppearance ??
  	/// CupertinoTheme.maybeBrightnessOf(context) ??
  	/// Theme.of(context).brightness
  	/// ```
  	///
  	/// See also: https://github.com/flutter/flutter/blob/06b9f7ba0bef2b5b44a643c73f4295a096de1202/packages/flutter/lib/src/services/text_input.dart#L621-L626
  	final Brightness? keyboardAppearance;

  and

[EchoEllet]

After the fix