chore(deps): update actions/upload-artifact action to v4 #947

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Lint Code (controller)	21s
Run Tests / Individual charm's integration tests (controller)	27m 31s
Run Tests / Unit Test (controller)	24s
Run Tests / Individual charm's integration tests (ui)	26m 38s
Run Tests / Lint Code (ui)	22s
Run Tests / Unit Test (ui)	27s
Run Tests / Bundle Integration	47m 5s
Run Tests / Check libraries (jupyter-controller) / Check libraries	26s
Run Tests / Check libraries (jupyter-controller) / Lint	8s
Run Tests / Check libraries (jupyter-ui) / Check libraries	26s
Run Tests / Check libraries (jupyter-ui) / Lint	9s
Publish Charm / Publish Charm (./charms/jupyter-ui)	17m 20s
Publish Charm / Publish Charm (./charms/jupyter-controller)	16m 31s
	2h 17m 51s

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