chore: update python dependencies + pin pip, blinker #993

Job	Run time
Publish Charm / Generate the Charm Matrix	4s
Run Tests / Individual charm's integration tests (controller)	31m 42s
Run Tests / Bundle Integration	5m 5s
Run Tests / Individual charm's integration tests (ui)	31m 11s
Run Tests / Lint Code (controller)	20s
Run Tests / Lint Code (ui)	25s
Run Tests / Unit Test (controller)	37s
Run Tests / Unit Test (ui)	41s
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	22s
Run Tests / Check libraries (jupyter-ui) / Lint	12s
Run Tests / Terraform (controller) / Lint / Lint Terraform	8s
Run Tests / Terraform (controller) / Check / Check Terraform	10s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 12s
Run Tests / Terraform (ui) / Check / Check Terraform	9s
Run Tests / Terraform (ui) / Apply / Apply Terraform	5m 45s
Run Tests / Terraform (ui) / Lint / Lint Terraform	7s
Publish Charm / Publish Charm (./charms/jupyter-ui)	18m 25s
Publish Charm / Publish Charm (./charms/jupyter-controller)	18m 33s
	1h 59m 50s

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