chore(deps): update actions/upload-artifact action to v4 #998

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Unit Test (controller)	37s
Run Tests / Unit Test (ui)	37s
Run Tests / Bundle Integration	32m 24s
Run Tests / Individual charm's integration tests (controller)	30m 53s
Run Tests / Lint Code (controller)	23s
Run Tests / Individual charm's integration tests (ui)	30m 6s
Run Tests / Lint Code (ui)	25s
Run Tests / Check libraries (jupyter-controller) / Check libraries	37s
Run Tests / Check libraries (jupyter-controller) / Lint	10s
Run Tests / Check libraries (jupyter-ui) / Check libraries	35s
Run Tests / Check libraries (jupyter-ui) / Lint	11s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 1s
Run Tests / Terraform (controller) / Check / Check Terraform	6s
Run Tests / Terraform (ui) / Apply / Apply Terraform	4m 55s
Run Tests / Terraform (controller) / Lint / Lint Terraform	10s
Run Tests / Terraform (ui) / Check / Check Terraform	11s
Run Tests / Terraform (ui) / Lint / Lint Terraform	8s
Publish Charm / Publish Charm (./charms/jupyter-ui)	18m 10s
Publish Charm / Publish Charm (./charms/jupyter-controller)	18m 14s
	2h 23m 58s

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