update notebook server images to final v1.8.0 release #740

Job	Run time
Run Tests / Individual charm's integration tests (controller)	15m 18s
Publish Charm / Generate the Charm Matrix	2s
Run Tests / Bundle Integration	19m 1s
Run Tests / Individual charm's integration tests (ui)	13m 0s
Run Tests / Lint Code (controller)	25s
Run Tests / Unit Test (controller)	28s
Run Tests / Lint Code (ui)	24s
Run Tests / Unit Test (ui)	25s
Run Tests / Check libraries (jupyter-controller) / Check libraries	24s
Run Tests / Check libraries (jupyter-controller) / Lint	10s
Run Tests / Check libraries (jupyter-ui) / Lint	9s
Run Tests / Check libraries (jupyter-ui) / Check libraries	28s
Publish Charm / Publish Charm (./charms/jupyter-ui)	3m 55s
Publish Charm / Publish Charm (./charms/jupyter-controller)	3m 34s
	57m 43s

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