ci: bump juju to 3.6 + charmcraft to 3.x/stable #725

Job	Run time
Run Tests / Lint	13s
Run Tests / Integration tests (microk8s) (katib-controller)	24m 0s
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Integration tests (microk8s) (katib-db-manager)	22m 36s
Run Tests / Test the bundle	55m 42s
Run Tests / Unit tests (katib-controller)	20s
Run Tests / Unit tests (katib-db-manager)	15s
Run Tests / Check libraries (katib-controller) / Lint	11s
Run Tests / Check libraries (katib-db-manager) / Check libraries	24s
Run Tests / Check libraries (katib-db-manager) / Lint	8s
Run Tests / Check libraries (katib-ui) / Check libraries	32s
Run Tests / Check libraries (katib-controller) / Check libraries	26s
Run Tests / Check libraries (katib-ui) / Lint	9s
Run Tests / Terraform (katib-controller) / Apply / Apply Terraform	6m 12s
Run Tests / Terraform (katib-controller) / Check / Check Terraform	9s
Run Tests / Terraform (katib-controller) / Lint / Lint Terraform	9s
Run Tests / Terraform (katib-db-manager) / Apply / Apply Terraform	5m 5s
Run Tests / Terraform (katib-db-manager) / Lint / Lint Terraform	11s
Run Tests / Terraform (katib-db-manager) / Check / Check Terraform	9s
Run Tests / Terraform (katib-ui) / Apply / Apply Terraform	5m 7s
Run Tests / Terraform (katib-ui) / Check / Check Terraform	7s
Run Tests / Terraform (katib-ui) / Lint / Lint Terraform	6s
Publish Charm / Publish Charm (./charms/katib-ui)	20m 55s
Publish Charm / Publish Charm (./charms/katib-controller)	13m 56s
Publish Charm / Publish Charm (./charms/katib-db-manager)	13m 44s
	2h 50m 49s

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