ci: bump juju, dependencies + pin pip #983

Job	Run time
Publish Charm / Generate the Charm Matrix	4s
Run Tests / Bundle Integration	4m 57s
Run Tests / Individual charm's integration tests (controller)	30m 13s
Run Tests / Lint Code (controller)	19s
Run Tests / Individual charm's integration tests (ui)	29m 49s
Run Tests / Lint Code (ui)	20s
Run Tests / Unit Test (controller)	45s
Run Tests / Unit Test (ui)	37s
Run Tests / Check libraries (jupyter-controller) / Check libraries	31s
Run Tests / Check libraries (jupyter-controller) / Lint	11s
Run Tests / Check libraries (jupyter-ui) / Check libraries	30s
Run Tests / Check libraries (jupyter-ui) / Lint	11s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 58s
Run Tests / Terraform (controller) / Check / Check Terraform	8s
Run Tests / Terraform (controller) / Lint / Lint Terraform	8s
Run Tests / Terraform (ui) / Apply / Apply Terraform	5m 20s
Run Tests / Terraform (ui) / Check / Check Terraform	9s
Run Tests / Terraform (ui) / Lint / Lint Terraform	10s
Publish Charm / Publish Charm (./charms/jupyter-ui)	18m 14s
Publish Charm / Publish Charm (./charms/jupyter-controller)	19m 1s
	1h 57m 35s

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