Update case studies to pymc v5 #353

Job	Run time
Execute docs/tutorials/lc-gp-transit.ipynb	1m 14s
Execute docs/tutorials/lc-multi.ipynb	1m 12s
Execute docs/tutorials/joint.ipynb	1m 31s
Execute docs/tutorials/tess.ipynb	1m 8s
Execute docs/tutorials/eb.ipynb	1m 13s
Execute docs/tutorials/quick-tess.ipynb	1m 33s
Execute docs/tutorials/stellar-variability.ipynb	1m 12s
Execute docs/tutorials/ttv.ipynb	1m 5s
Execute docs/tutorials/rv-multi.ipynb	1m 8s
Execute docs/tutorials/astrometric.ipynb	1m 20s
Execute docs/tutorials/transit.ipynb	1m 13s
Execute docs/tutorials/rv.ipynb	1m 22s
Build the docs page	0s
	15m 11s

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