chore(deps): update actions/upload-artifact action to v4 #923

Job	Run time
Run Tests / Bundle Integration	27m 7s
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Individual charm's integration tests (controller)	22m 35s
Run Tests / Individual charm's integration tests (ui)	20m 36s
Run Tests / Lint Code (controller)	23s
Run Tests / Lint Code (ui)	22s
Run Tests / Unit Test (controller)	29s
Run Tests / Unit Test (ui)	28s
Run Tests / Check libraries (jupyter-controller) / Check libraries	28s
Run Tests / Check libraries (jupyter-controller) / Lint	11s
Run Tests / Check libraries (jupyter-ui) / Check libraries	28s
Run Tests / Check libraries (jupyter-ui) / Lint	10s
Publish Charm / Publish Charm (./charms/jupyter-controller)	10m 34s
Publish Charm / Publish Charm (./charms/jupyter-ui)	10m 58s
	1h 34m 52s

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