Type hints in `pint.fitter` #4783

Job	Run time
macos-latest-py313	1h 6m 10s
ubuntu-latest, ephemeris_connection	1m 3s
ubuntu-latest, black	24s
ubuntu-latest, py313-test-cov	1h 29m 25s
ubuntu-latest, notebooks	5m 13s
ubuntu-latest, oldestdeps	29m 8s
	3h 11m 23s

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