Bump androidxTest from 1.6.2 to 1.7.0 #1572

Job	Run time
Build (Unit-tests & Android-Lint)	1h 36m 5s
Android UI-tests on emulator (23, default)	12m 29s
Android UI-tests on emulator (26, default)	11m 34s
Android UI-tests on emulator (30, default)	16m 22s
Android UI-tests on emulator (32, default)	11m 18s
Android UI-tests on emulator (25, default)	12m 10s
Android UI-tests on emulator (31, default)	12m 53s
Android UI-tests on emulator (35, default)	17m 26s
Android UI-tests on emulator (34, default)	13m 36s
Android UI-tests on emulator (36, default)	40s
Android UI-tests on emulator (27, default)	11m 22s
Android UI-tests on emulator (24, default)	10m 42s
Android UI-tests on emulator (33, default)	11m 33s
Android UI-tests on emulator (28, default)	13m 22s
Android UI-tests on emulator (29, default)	15m 5s
	4h 26m 37s

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