ensure trained_model is a Path before calling .suffix #709

Job	Run time
Check Linting	13s
Check Manifest	19s
Run tests with numba disabled	12m 12s
Run brainmapper tests to check for breakages	15m 5s
Run package tests (ubuntu-latest, 3.10)	11m 58s
Run package tests (ubuntu-latest, 3.11)	12m 20s
Run package tests (ubuntu-latest, 3.12)	15m 1s
Run package tests (macos-latest, 3.12)	10m 6s
Run package tests (windows-latest, 3.12)	15m 51s
Build source distribution	0s
Publish build distributions	0s
	1h 33m 5s

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