chore: update python dependencies + pin pip, blinker #994

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Individual charm's integration tests (controller)	30m 16s
Run Tests / Bundle Integration	32m 21s
Run Tests / Lint Code (controller)	23s
Run Tests / Individual charm's integration tests (ui)	30m 23s
Run Tests / Lint Code (ui)	21s
Run Tests / Unit Test (controller)	35s
Run Tests / Unit Test (ui)	37s
Run Tests / Check libraries (jupyter-controller) / Check libraries	26s
Run Tests / Check libraries (jupyter-controller) / Lint	9s
Run Tests / Check libraries (jupyter-ui) / Check libraries	29s
Run Tests / Check libraries (jupyter-ui) / Lint	9s
Run Tests / Terraform (controller) / Apply / Apply Terraform	5m 14s
Run Tests / Terraform (controller) / Check / Check Terraform	6s
Run Tests / Terraform (controller) / Lint / Lint Terraform	8s
Run Tests / Terraform (ui) / Apply / Apply Terraform	5m 2s
Run Tests / Terraform (ui) / Check / Check Terraform	7s
Run Tests / Terraform (ui) / Lint / Lint Terraform	8s
Publish Charm / Publish Charm (./charms/jupyter-ui)	18m 19s
Publish Charm / Publish Charm (./charms/jupyter-controller)	18m 22s
	2h 23m 38s

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