Update dependency @react-native-picker/picker to v2.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@react-native-picker/picker	2.3.1 -> 2.4.0

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Release Notes

react-native-picker/picker

### [`v2.4.0`](https://togithub.com/react-native-picker/picker/releases/v2.4.0) [Compare Source](https://togithub.com/react-native-picker/picker/compare/v2.3.1...v2.4.0) ##### Bug Fixes - Workaround XAML bug with ComboBox and dark theme ([#​380](https://togithub.com/react-native-picker/picker/issues/380)) ([20cac25](https://togithub.com/react-native-picker/picker/commit/20cac25)) ##### Features - Add placeholder support for Windows ([#​386](https://togithub.com/react-native-picker/picker/issues/386)) ([16cdaee](https://togithub.com/react-native-picker/picker/commit/16cdaee))

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