chore(backport-1.17): Pin charmcraft channel to `3.x/stable` #1187

Job	Run time
Publish Charm / Generate the Charm Matrix	2s
Run Tests / Unit Test (pilot)	39s
Run Tests / Integration Test (1.25-strict/stable, integration)	1h 3m 49s
Run Tests / Unit Test (gateway)	29s
Run Tests / Observability Integration Test (1.25-strict/stable)	55m 53s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-provider)	59m 10s
Run Tests / Lint Code (pilot)	25s
Run Tests / Integration Test (1.25-strict/stable, integration-tls-secret)	57m 54s
Run Tests / Observability Integration Test (1.26-strict/stable)	55m 1s
Run Tests / Lint Code (gateway)	20s
Run Tests / Integration Test (1.26-strict/stable, integration)	1h 5m 17s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-provider)	57m 54s
Run Tests / Integration Test (1.26-strict/stable, integration-tls-secret)	59m 30s
Run Tests / Check libraries (istio-gateway) / Check libraries	4s
Run Tests / Check libraries (istio-gateway) / Lint	9s
Run Tests / Check libraries (istio-pilot) / Check libraries	32s
Run Tests / Check libraries (istio-pilot) / Lint	10s
Publish Charm / Publish Charm (./charms/istio-pilot)	41m 25s
Publish Charm / Publish Charm (./charms/istio-gateway)	15m 4s
	8h 53m 47s

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