chore(deps): update actions/upload-artifact action to v4 #979

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Bundle Integration	34m 45s
Run Tests / Individual charm's integration tests (controller)	20m 7s
Run Tests / Individual charm's integration tests (ui)	20m 27s
Run Tests / Lint Code (controller)	24s
Run Tests / Unit Test (controller)	25s
Run Tests / Lint Code (ui)	22s
Run Tests / Unit Test (ui)	27s
Run Tests / Check libraries (jupyter-controller) / Lint	12s
Run Tests / Check libraries (jupyter-ui) / Check libraries	8m 51s
Run Tests / Check libraries (jupyter-ui) / Lint	12s
Run Tests / Check libraries (jupyter-controller) / Check libraries	4m 29s
Run Tests / Terraform (controller) / Apply / Apply Terraform	23m 11s
Run Tests / Terraform (controller) / Check / Check Terraform	6s
Run Tests / Terraform (controller) / Lint / Lint Terraform	8s
Run Tests / Terraform (ui) / Apply / Apply Terraform	15m 16s
Run Tests / Terraform (ui) / Check / Check Terraform	6s
Run Tests / Terraform (ui) / Lint / Lint Terraform	9s
Publish Charm / Publish Charm (./charms/jupyter-ui)	9m 15s
Publish Charm / Publish Charm (./charms/jupyter-controller)	12m 4s
	2h 31m 1s

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