build: unpin setuptools and pip in charmcraft.yaml as pypa/setuptools_scm#713 is fixed #583

Job	Run time
Run Tests / Integration Test	17m 35s
Run Tests / Observability Integration Test	15m 17s
Publish Charm / Generate the Charm Matrix	3s
Run Tests / Lint Code (pilot)	34s
Run Tests / Lint Code (gateway)	43s
Run Tests / Unit Test (pilot)	40s
Run Tests / Unit Test (gateway)	42s
Run Tests / Check libraries (istio-pilot) / Check libraries	20s
Run Tests / Check libraries (istio-gateway) / Check libraries	5s
Run Tests / Check libraries (istio-gateway) / Lint	11s
Run Tests / Check libraries (istio-pilot) / Lint	11s
Publish Charm / Publish Charm (./charms/istio-pilot)	4m 47s
Publish Charm / Publish Charm (./charms/istio-gateway)	3m 22s
	44m 30s

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