chore: update python dependencies + pin pip #490

Job	Run time
Run Tests / Lint	10s
Run Tests / Lint	10s
Run Tests / Integration	31m 36s
Run Tests / Integration	31m 36s
Publish Charm / Generate the Charm Matrix	2s
Publish Charm / Generate the Charm Matrix	2s
Run Tests / Unit	19s
Run Tests / Unit	19s
Run Tests / Check libraries / Lint	9s
Run Tests / Check libraries / Lint	9s
Run Tests / Check libraries / Check libraries	24s
Run Tests / Check libraries / Check libraries	24s
Run Tests / Terraform / Apply / Apply Terraform	4m 58s
Run Tests / Terraform / Apply / Apply Terraform	4m 58s
Run Tests / Terraform / Check / Check Terraform	6s
Run Tests / Terraform / Check / Check Terraform	6s
Run Tests / Terraform / Lint / Lint Terraform	7s
Run Tests / Terraform / Lint / Lint Terraform	7s
Publish Charm / Publish Charm (./)	19m 0s
Publish Charm / Publish Charm (./)	18m 37s
	1h 53m 19s

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