replace Datalab load/save from pickle to json #5400

Job	Run time
Check for unused/wildcard imports	8s
Lint Notebooks	4s
Format	9s
Test without optional dependencies and with minimum compatible versions of dependencies	50s
Test: Python 3.8 on ubuntu-latest	11m 47s
Type check	3m 20s
Test: Python 3.9 on ubuntu-latest	12m 24s
Test: Python 3.10 on ubuntu-latest	12m 47s
Test: Python 3.11 on ubuntu-latest	12m 15s
Test: Python 3.8 on macos-13	45m 17s
Test: Python 3.9 on macos-13	46m 5s
Test: Python 3.10 on macos-13	40m 27s
Test: Python 3.11 on macos-13	50m 38s
Test: Python 3.8 on windows-latest	38m 49s
Test: Python 3.9 on windows-latest	39m 58s
Test: Python 3.10 on windows-latest	41m 17s
Test: Python 3.11 on windows-latest	46m 10s
	6h 42m 25s

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