Bump to `4.15.0` #251

Job	Run time
Lint	1m 16s
Run Unit Tests	1m 15s
Build iOS	3m 47s
Build Android	8m 25s
Build macOS Desktop	5m 0s
Build Web	2m 2s
Build Windows Desktop	6m 48s
BrowserStack iOS Testing	43m 21s
BrowserStack Android Testing	31m 25s
Test Summary	3s
	1h 43m 22s

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