ci: bump juju to 3.6 + charmcraft to 3.x/stable #1226

Job	Run time
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Observability Integration Test (1.25-strict/stable)	36m 6s
Run Tests / Integration Test (1.27-strict/stable, integration)	40m 13s
Run Tests / Lint Code (pilot)	21s
Run Tests / Observability Integration Test (1.26-strict/stable)	37m 3s
Run Tests / Lint Code (gateway)	21s
Run Tests / Integration Test (1.27-strict/stable, integration-tls-provider)	40m 21s
Run Tests / Integration Test (1.27-strict/stable, integration-tls-secret)	34m 54s
Run Tests / Integration Test (1.30-strict/stable, integration)	42m 57s
Run Tests / Unit Test (pilot)	55s
Run Tests / Integration Test (1.30-strict/stable, integration-tls-provider)	38m 26s
Run Tests / Unit Test (gateway)	33s
Run Tests / Integration Test (1.30-strict/stable, integration-tls-secret)	36m 48s
Run Tests / Check libraries (istio-gateway) / Check libraries	40s
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
Run Tests / Terraform (gateway) / Check / Check Terraform	6s
Run Tests / Terraform (gateway) / Apply / Apply Terraform	5m 50s
Run Tests / Terraform (gateway) / Lint / Lint Terraform	9s
Run Tests / Terraform (pilot) / Apply / Apply Terraform	5m 57s
Run Tests / Terraform (pilot) / Check / Check Terraform	5s
Run Tests / Terraform (pilot) / Lint / Lint Terraform	8s
Publish Charm / Publish Charm (./charms/istio-gateway)	13m 18s
Publish Charm / Publish Charm (./charms/istio-pilot)	17m 20s
	5h 53m 25s

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