chore(deps): update actions/checkout action to v4 #742

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Integration tests (microk8s) (katib-controller)	22m 19s
Run Tests / Lint	18s
Run Tests / Integration tests (microk8s) (katib-db-manager)	22m 47s
Run Tests / Unit tests (katib-controller)	22s
Run Tests / Test the bundle	58m 58s
Run Tests / Unit tests (katib-db-manager)	15s
Run Tests / Check libraries (katib-controller) / Check libraries	29s
Run Tests / Check libraries (katib-controller) / Lint	11s
Run Tests / Check libraries (katib-db-manager) / Check libraries	29s
Run Tests / Check libraries (katib-ui) / Check libraries	32s
Run Tests / Check libraries (katib-db-manager) / Lint	10s
Run Tests / Check libraries (katib-ui) / Lint	9s
Run Tests / Terraform (katib-controller) / Apply / Apply Terraform	5m 20s
Run Tests / Terraform (katib-controller) / Check / Check Terraform	9s
Run Tests / Terraform (katib-controller) / Lint / Lint Terraform	10s
Run Tests / Terraform (katib-db-manager) / Apply / Apply Terraform	4m 52s
Run Tests / Terraform (katib-db-manager) / Check / Check Terraform	5s
Run Tests / Terraform (katib-db-manager) / Lint / Lint Terraform	10s
Run Tests / Terraform (katib-ui) / Check / Check Terraform	6s
Run Tests / Terraform (katib-ui) / Lint / Lint Terraform	7s
Run Tests / Terraform (katib-ui) / Apply / Apply Terraform	6m 5s
Publish Charm / Publish Charm (./charms/katib-ui)	20m 54s
Publish Charm / Publish Charm (./charms/katib-controller)	13m 28s
Publish Charm / Publish Charm (./charms/katib-db-manager)	13m 12s
	2h 51m 42s

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