fix: fix use of computed_field setter with field_dependencies

[tlambert03]

fixes #334

[codspeed-hq]

CodSpeed Performance Report

Merging #336 will not alter performance

_{Comparing tlambert03:fix-computed-field (adfd566) with main (37bd312)}

Summary

✅ 67 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (37bd312) to head (adfd566).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #336   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         2076      2084    +8     
=========================================
+ Hits          2076      2084    +8     

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[sjdemartini]

Awesome, thank you for adding this! Looks great from the tests!

[sjdemartini]

Minor note: while you're here, looks like the error message is missing a space here

psygnal/src/psygnal/_evented_model.py

Lines 338 to 339 in 6d5b644

	"Fields with dependencies must be fields or property.setters."
	f"{prop!r} is not."

after property.setters., which makes the error message appear like:

ValueError: Fields with dependencies must be fields or property.setters.'c' is not.