Bump gradle/actions from 5 to 6 #2000

Job	Run time
Build (Unit-tests & Android-Lint)	3h 27m 1s
Android UI-tests on emulator (29, default)	15m 27s
Android UI-tests on emulator (27, default)	14m 32s
Android UI-tests on emulator (24, default)	14m 35s
Android UI-tests on emulator (25, default)	11m 48s
Android UI-tests on emulator (23, default)	9m 15s
Android UI-tests on emulator (33, default)	6m 59s
Android UI-tests on emulator (34, default)	7m 38s
Android UI-tests on emulator (32, default)	7m 57s
Android UI-tests on emulator (35, default)	18m 15s
Android UI-tests on emulator (28, default)	6m 52s
Android UI-tests on emulator (30, default)	8m 53s
Android UI-tests on emulator (26, default)	7m 25s
Android UI-tests on emulator (36, default)	7m 35s
Android UI-tests on emulator (31, default)	7m 1s
	5h 51m 13s

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