tests: pin deployed charms to a CKF 1.8 compatible version #353

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Lint Code (argo-controller)	37s
Run Tests / Integration Test (argo-controller)	6m 31s
Run Tests / Lint Code (argo-server)	36s
Run Tests / Unit Tests (argo-controller)	59s
Run Tests / Unit Tests (argo-server)	44s
Run Tests / Check libraries (argo-controller) / Check libraries	27s
Run Tests / Check libraries (argo-controller) / Lint	13s
Run Tests / Check libraries (argo-server) / Check libraries	1m 42s
Run Tests / Check libraries (argo-server) / Lint	12s
Publish Charm / Publish Charm (./charms/argo-controller)	4m 37s
Publish Charm / Publish Charm (./charms/argo-server)	1m 24s
	18m 5s

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