add changelog for 0.66.3 (facebook#32576)

Summary:
lunaleaps did [0.66.3](https://github.com/facebook/react-native/releases/tag/v0.66.3) yesterday - this PR adds the entries for it in the changelog.md file.

## Changelog

[Internal] [Changed] - add changelog entry for 0.66.3

Pull Request resolved: facebook#32576

Test Plan: N/A

Reviewed By: lunaleaps

Differential Revision: D32321194

Pulled By: yungsters

fbshipit-source-id: dadffb21fd9ece245acf761947e8fef544a00b7d

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## v0.66.3
+
+### Changed
+
+- Rename deprecated `Keyboard.removeEventListener` to `Keyboard.removeListener`. ([8880c09076](https://github.com/facebook/react-native/commit/8880c09076e4727768ace26a74766cbe6f64021c) by [@yungsters](https://github.com/yungsters))
+
+### Fixed
+
+- Revert changes in Jest preprocessor to fix tests in external projects ([142090a5f3fa7](https://github.com/facebook/react-native/commit/142090a5f3fa7c3ab2ed4c536792e3f26582bd3b) by [@rubennorte](https://github.com/rubennorte))
+
 ## v0.66.2
 
 ### Fixed