ci(upload-charm): use charmcraft from latest/candidate in track/1.21 #1166

Job	Run time
Publish Charm / Generate the Charm Matrix	6s
Run Tests / Observability Integration Test (1.25-strict/stable)	55m 46s
Run Tests / Integration Test (1.26-strict/stable, integration)	1h 2m 37s
Run Tests / Observability Integration Test (1.26-strict/stable)	55m 51s
Run Tests / Lint Code (pilot)	23s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-provider)	1h 0m 36s
Run Tests / Lint Code (gateway)	22s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-secret)	56m 28s
Run Tests / Unit Test (pilot)	40s
Run Tests / Integration Test (1.29-strict/stable, integration)	1h 0m 28s
Run Tests / Unit Test (gateway)	32s
Run Tests / Integration Test (1.29-strict/stable, integration-tls-provider)	1h 0m 19s
Run Tests / Integration Test (1.29-strict/stable, integration-tls-secret)	56m 20s
Run Tests / Check libraries (istio-gateway) / Check libraries	5s
Run Tests / Check libraries (istio-gateway) / Lint	11s
Run Tests / Check libraries (istio-pilot) / Check libraries	30s
Run Tests / Check libraries (istio-pilot) / Lint	8s
Publish Charm / Publish Charm (./charms/istio-pilot)	40m 41s
Publish Charm / Publish Charm (./charms/istio-gateway)	15m 53s
	8h 47m 56s

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