Changed 'upstream_data_directories' field in MachineConfig into a dic… #2302

Job	Run time
Static Analysis	15s
Build package	14s
Build package	5s
Call ci unit tests workflow / Run tests (3.10)	2m 18s
Call ci unit tests workflow / Run tests (3.11)	2m 1s
Call ci unit tests workflow / Run tests (3.12)	2m 7s
	7m 0s

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