Bump com.google.firebase:firebase-bom from 33.5.1 to 33.9.0 #1424

Job	Run time
Build (Unit-tests & Android-Lint)	1h 50m 29s
Android UI-tests on emulator (21, default)	11m 55s
Android UI-tests on emulator (22, default)	11m 22s
Android UI-tests on emulator (23, default)	11m 44s
Android UI-tests on emulator (24, default)	11m 20s
Android UI-tests on emulator (25, default)	11m 32s
Android UI-tests on emulator (26, default)	12m 33s
Android UI-tests on emulator (27, default)	10m 5s
Android UI-tests on emulator (28, default)	9m 50s
Android UI-tests on emulator (29, default)	9m 51s
Android UI-tests on emulator (30, default)	12m 48s
Android UI-tests on emulator (31, default)	13m 0s
Android UI-tests on emulator (32, default)	12m 13s
Android UI-tests on emulator (33, default)	10m 57s
Android UI-tests on emulator (34, default)	13m 43s
Android UI-tests on emulator (35, default)	12m 33s
	4h 45m 55s

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