chore(deps): update actions/checkout action to v4 #782

Job	Run time
Publish Charm / Generate the Charm Matrix	4s
Run Tests / Integration tests (microk8s) (katib-controller)	29m 19s
Run Tests / Lint	16s
Run Tests / Integration tests (microk8s) (katib-db-manager)	26m 43s
Run Tests / Test the bundle	1h 41m 34s
Run Tests / Unit tests (katib-controller)	23s
Run Tests / Unit tests (katib-db-manager)	17s
Run Tests / Check libraries (katib-controller) / Check libraries	32s
Run Tests / Check libraries (katib-controller) / Lint	11s
Run Tests / Check libraries (katib-db-manager) / Check libraries	36s
Run Tests / Check libraries (katib-db-manager) / Lint	8s
Run Tests / Check libraries (katib-ui) / Lint	10s
Run Tests / Check libraries (katib-ui) / Check libraries	26s
Run Tests / Terraform (katib-controller) / Apply / Apply Terraform	5m 7s
Run Tests / Terraform (katib-controller) / Check / Check Terraform	9s
Run Tests / Terraform (katib-controller) / Lint / Lint Terraform	7s
Run Tests / Terraform (katib-db-manager) / Apply / Apply Terraform	4m 55s
Run Tests / Terraform (katib-db-manager) / Check / Check Terraform	5s
Run Tests / Terraform (katib-db-manager) / Lint / Lint Terraform	7s
Run Tests / Terraform (katib-ui) / Check / Check Terraform	6s
Run Tests / Terraform (katib-ui) / Apply / Apply Terraform	5m 58s
Run Tests / Terraform (katib-ui) / Lint / Lint Terraform	8s
Publish Charm / Publish Charm (./charms/katib-ui)	50m 25s
Publish Charm / Publish Charm (./charms/katib-controller)	17m 28s
Publish Charm / Publish Charm (./charms/katib-db-manager)	17m 10s
	4h 22m 24s

Provide feedback