ci(upload-charm): use charmcraft from latest/candidate #942

Job	Run time
Run Tests / Individual charm's integration tests (controller)	29m 12s
Run Tests / Bundle Integration	46m 25s
Run Tests / Individual charm's integration tests (ui)	29m 36s
Publish Charm / Generate the Charm Matrix	6s
Run Tests / Lint Code (controller)	23s
Run Tests / Lint Code (ui)	2m 53s
Run Tests / Unit Test (controller)	34s
Run Tests / Unit Test (ui)	38s
Run Tests / Check libraries (jupyter-controller) / Check libraries	36s
Run Tests / Check libraries (jupyter-controller) / Lint	18s
Run Tests / Check libraries (jupyter-ui) / Check libraries	4m 43s
Run Tests / Check libraries (jupyter-ui) / Lint	31s
Publish Charm / Publish Charm (./charms/jupyter-ui)	16m 53s
Publish Charm / Publish Charm (./charms/jupyter-controller)	17m 50s
	2h 30m 38s

Provide feedback