add 0.66.4 changelog (#32733)
add 0.66.4 changelog (#32733)

Summary:
lunaleaps did [0.66.4](https://github.com/facebook/react-native/releases/tag/v0.66.4) yesterday - this PR adds the entries for it in the changelog.md file.

## Changelog

[Internal] [Changed] - add changelog entry for 0.66.4

Pull Request resolved: https://github.com/facebook/react-native/pull/32733

Test Plan: N/A

Reviewed By: lunaleaps

Differential Revision: D33017547

Pulled By: cortinico

fbshipit-source-id: 2ffad5d65c7b308686f29395fb6fc54b85804bf0

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