chore:(gooddata-pipelines): user orjson to load test data #1029

Job	Run time
Collect changes / collect-changes	9s
Python tests / lint-and-format-check	42s
Python tests / unit-tests (py310)	3m 0s
Python tests / unit-tests (py39)	3m 6s
Python tests / unit-tests (py311)	3m 3s
Python tests / unit-tests (py313)	3m 45s
Python tests / types-check	1m 19s
Python tests / unit-tests (py312)	7m 44s
status-check	4s
	22m 52s

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