4335 [image_picker] Bump minimum Flutter version and iOS deployment target (cla: yes, waiting for tree to go green, p: image_picker, platform-ios)

4336 [image_picker] Update README for image_picker’s retrieveLostData() to support multiple files (cla: yes, waiting for tree to go green, p: image_picker)

4389 [image_picker_for_web] Added support for maxWidth, maxHeight and imageQuality  (cla: yes, waiting for tree to go green, p: image_picker, platform-web)

4408 [image_picker][android] suppress unchecked warning (cla: yes, waiting for tree to go green, p: image_picker, platform-android)

4421 [image_picker] doc:readme image picker misprints (cla: yes, waiting for tree to go green, p: image_picker)