docs(readme): fix minimum iOS version in requirements section

[monholm]

Summary

react-native@0.69 bumped minimum iOS version to 12.4. This change aligns the readme requirements section.

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,830,931	+0
android	hermes	armeabi-v7a	7,217,136	+0
android	hermes	x86	8,139,923	+0
android	hermes	x86_64	8,121,680	+0
android	jsc	arm64-v8a	9,696,560	+0
android	jsc	armeabi-v7a	8,451,835	+0
android	jsc	x86	9,647,268	+0
android	jsc	x86_64	10,245,093	+0

Base commit: 71e8921
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: d9b8e07
Branch: main

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[facebook-github-bot]

@philIip has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @Simon-TechForm in ec3c8f4.

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