Bump marshmallow from 3.20.1 to 3.23.0 #829

Job	Run time
lint	33s
unit (utests)	55s
integration (tests-noqueue, QuickTest)	1m 41s
unit (tests-api-mock)	46s
integration (tests-noqueue, BuildFailedTest)	33s
unit (tests-server)	55s
integration (tests-noqueue, RepositoryTests)	36s
integration (tests-noqueue, TestBertE)	5m 34s
integration (tests-noqueue, TestQueueing)	31s
integration (tests-noqueue, TaskQueueTests)	3m 32s
integration (tests, QuickTest)	1m 47s
integration (tests, BuildFailedTest)	34s
integration (tests, RepositoryTests)	32s
integration (tests, TestBertE)	7m 30s
integration (tests, TestQueueing)	5m 35s
integration (tests, TaskQueueTests)	3m 26s
	35m 0s

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