Update requirements in README (facebook#48079)

Summary:
Pull Request resolved: facebook#48079

We updated these in 0.76, and should update them in the README as well. https://reactnative.dev/blog/2024/10/23/release-0.76-new-architecture#updates-to-minimum-ios-and-android-sdk-requirements

Changelog: [Internal]

Reviewed By: lunaleaps, philIip

Differential Revision: D66735446

fbshipit-source-id: c9145bab14e4956ed070fb906dd1c1676905bfb6

README.md

@@ -67,7 +67,7 @@ React Native is developed and supported by many companies and individual core co
 
 ## 📋 Requirements
 
-React Native apps may target iOS 13.4 and Android 6.0 (API 23) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like [Expo](https://expo.dev) can be used to work around this.
+React Native apps may target iOS 15.1 and Android 7.0 (API 24) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like [Expo](https://expo.dev) can be used to work around this.
 
 ## 🎉 Building your first React Native app