ci: bump juju to 3.6 + charmcraft to 3.x/stable (#416) #160

Job	Run time
Run Tests / Bundle Integration	19m 57s
Run Tests / Individual charm's integration tests (controller)	18m 33s
Run Tests / Lint Code (controller)	22s
Run Tests / Individual charm's integration tests (ui)	16m 44s
Run Tests / Lint Code (ui)	22s
Run Tests / Unit Test (controller)	24s
Run Tests / Unit Test (ui)	35s
Run Tests / Check libraries (jupyter-controller) / Check libraries	24s
Run Tests / Check libraries (jupyter-controller) / Lint	10s
Run Tests / Check libraries (jupyter-ui) / Check libraries	26s
Run Tests / Check libraries (jupyter-ui) / Lint	10s
Run Tests / Terraform (controller) / Lint / Lint Terraform	13s
Run Tests / Terraform (controller) / Check / Check Terraform	11s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 4s
Run Tests / Terraform (ui) / Apply / Apply Terraform	5m 31s
Run Tests / Terraform (ui) / Check / Check Terraform	9s
Run Tests / Terraform (ui) / Lint / Lint Terraform	7s
Publish Charm / Generate the Charm Matrix	5s
Publish Charm / Publish Charm (./charms/jupyter-ui)	7m 17s
Publish Charm / Publish Charm (./charms/jupyter-controller)	7m 16s
	1h 24m 0s

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