chore(deps): update actions/upload-artifact action to v4 #763

Job	Run time
Run Tests / Individual charm's integration tests (controller)	14m 25s
Run Tests / Unit Test (controller)	22s
Run Tests / Individual charm's integration tests (ui)	17m 13s
Run Tests / Unit Test (ui)	1m 11s
Publish Charm / Generate the Charm Matrix	2s
Run Tests / Bundle Integration	17m 32s
Run Tests / Lint Code (controller)	22s
Run Tests / Lint Code (ui)	21s
Run Tests / Check libraries (jupyter-controller) / Check libraries	24s
Run Tests / Check libraries (jupyter-controller) / Lint	12s
Run Tests / Check libraries (jupyter-ui) / Check libraries	30s
Run Tests / Check libraries (jupyter-ui) / Lint	9s
Publish Charm / Publish Charm (./charms/jupyter-ui)	5m 26s
Publish Charm / Publish Charm (./charms/jupyter-controller)	4m 32s
	1h 2m 41s

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