build: Update kotlinx-serialization version #2012

Job	Run time
Build (Unit-tests & Android-Lint)	2h 25m 15s
Android UI-tests on emulator (26, default)	15m 11s
Android UI-tests on emulator (27, default)	16m 49s
Android UI-tests on emulator (24, default)	16m 48s
Android UI-tests on emulator (23, default)	15m 37s
Android UI-tests on emulator (25, default)	15m 13s
Android UI-tests on emulator (28, default)	18m 15s
Android UI-tests on emulator (36, default)	15m 47s
Android UI-tests on emulator (33, default)	17m 58s
Android UI-tests on emulator (31, default)	18m 14s
Android UI-tests on emulator (29, default)	15m 28s
Android UI-tests on emulator (34, default)	16m 11s
Android UI-tests on emulator (35, default)	19m 29s
Android UI-tests on emulator (32, default)	14m 32s
Android UI-tests on emulator (30, default)	17m 7s
	6h 17m 54s

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