chore: upgrade openapi-generator-cli from v6.0.1 to v6.6.0 #1380

Job	Run time
Collect changes / collect-changes	9s
Python tests / types-check	23s
Python tests / unit-tests (py314)	53s
Python tests / lint-and-format-check	15s
Python tests / unit-tests (py311)	38s
Python tests / unit-tests (py310)	39s
Python tests / unit-tests (py313)	53s
Python tests / unit-tests (py312)	54s
status-check	3s
Python tests / unit-tests (py314)	2m 50s
Python tests / unit-tests (py312)	2m 23s
Python tests / unit-tests (py311)	3m 25s
Python tests / unit-tests (py313)	2m 49s
Python tests / lint-and-format-check	22s
Python tests / unit-tests (py310)	3m 55s
Python tests / types-check	23s
Collect changes / collect-changes	9s
status-check	3s
	21m 6s

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