update the notebook used in the lab to use the true 2.5D code #202

Job	Run time
Ex1 (3.8, ubuntu-latest, tests/test_dcip.py)	36m 34s
Ex1 (3.8, ubuntu-latest, tests/test_em.py)	4h 6m 55s
Ex1 (3.8, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	3h 30m 46s
Ex1 (3.8, ubuntu-latest, tests/test_inversion.py)	1h 10m 38s
Ex1 (3.8, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	35m 47s
Ex1 (3.10, ubuntu-latest, tests/test_dcip.py)	36m 24s
Ex1 (3.10, ubuntu-latest, tests/test_em.py)	1h 46m 57s
Ex1 (3.10, ubuntu-latest, tests/test_gpr.py tests/test_seismic.py)	4h 5m 40s
Ex1 (3.10, ubuntu-latest, tests/test_inversion.py)	31s
Ex1 (3.10, ubuntu-latest, tests/test_gravity.py tests/test_mag.py)	35m 46s
	17h 5m 58s

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