chore(deps): update terraform juju to ~> 0.15.0 #977

Job	Run time
Publish Charm / Generate the Charm Matrix	5s
Run Tests / Individual charm's integration tests (controller)	35m 51s
Run Tests / Unit Test (controller)	28s
Run Tests / Lint Code (controller)	42s
Run Tests / Individual charm's integration tests (ui)	34m 16s
Run Tests / Unit Test (ui)	29s
Run Tests / Lint Code (ui)	46s
Run Tests / Bundle Integration	28m 39s
Run Tests / Check libraries (jupyter-controller) / Check libraries	31s
Run Tests / Check libraries (jupyter-controller) / Lint	12s
Run Tests / Check libraries (jupyter-ui) / Check libraries	4m 35s
Run Tests / Check libraries (jupyter-ui) / Lint	12s
Run Tests / Terraform (controller) / Apply / Apply Terraform	11m 58s
Run Tests / Terraform (controller) / Lint / Lint Terraform	7s
Run Tests / Terraform (controller) / Check / Check Terraform	7s
Run Tests / Terraform (ui) / Apply / Apply Terraform	16m 42s
Run Tests / Terraform (ui) / Check / Check Terraform	9s
Run Tests / Terraform (ui) / Lint / Lint Terraform	10s
Publish Charm / Publish Charm (./charms/jupyter-ui)	16m 34s
Publish Charm / Publish Charm (./charms/jupyter-controller)	7m 23s
	2h 39m 56s

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