chore(deps): update actions/upload-artifact action to v4 #1014

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Individual charm's integration tests (controller)	31m 5s
Run Tests / Individual charm's integration tests (ui)	29m 50s
Run Tests / Unit Test (controller)	37s
Run Tests / Unit Test (ui)	38s
Run Tests / Bundle Integration	34m 12s
Run Tests / Lint Code (controller)	21s
Run Tests / Lint Code (ui)	22s
Run Tests / Check libraries (jupyter-controller) / Check libraries	23s
Run Tests / Check libraries (jupyter-controller) / Lint	11s
Run Tests / Check libraries (jupyter-ui) / Check libraries	27s
Run Tests / Check libraries (jupyter-ui) / Lint	10s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 32s
Run Tests / Terraform (controller) / Check / Check Terraform	7s
Run Tests / Terraform (controller) / Lint / Lint Terraform	6s
Run Tests / Terraform (ui) / Apply / Apply Terraform	5m 17s
Run Tests / Terraform (ui) / Check / Check Terraform	5s
Run Tests / Terraform (ui) / Lint / Lint Terraform	6s
Publish Charm / Publish Charm (./charms/jupyter-ui)	19m 8s
Publish Charm / Publish Charm (./charms/jupyter-controller)	19m 35s
	2h 28m 15s

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