ci(upload-charm): use charmcraft from latest/candidate (#396) #150

Job	Run time
Run Tests / Lint Code (controller)	23s
Run Tests / Individual charm's integration tests (controller)	27m 57s
Run Tests / Lint Code (ui)	24s
Run Tests / Bundle Integration	48m 20s
Run Tests / Unit Test (controller)	53s
Run Tests / Individual charm's integration tests (ui)	28m 12s
Run Tests / Unit Test (ui)	30s
Run Tests / Check libraries (jupyter-controller) / Check libraries	26s
Run Tests / Check libraries (jupyter-controller) / Lint	9s
Run Tests / Check libraries (jupyter-ui) / Check libraries	34s
Run Tests / Check libraries (jupyter-ui) / Lint	17s
Publish Charm / Generate the Charm Matrix	4s
Publish Charm / Publish Charm (./charms/jupyter-ui)	16m 42s
Publish Charm / Publish Charm (./charms/jupyter-controller)	16m 57s
	2h 21m 48s

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