Fix linting syntax error

[freemansw1]

Well, #465 fixed most of our CI, but I inadvertently broke the linting YAML. This should fix it, hopefully.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.67%. Comparing base (706b3ee) to head (ddf7f96).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #466   +/-   ##
=======================================
  Coverage   60.67%   60.67%           
=======================================
  Files          23       23           
  Lines        3537     3537           
=======================================
  Hits         2146     2146           
  Misses       1391     1391           

Flag	Coverage Δ
unittests	60.67% <ø> (ø)

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[w-k-jones]

Thanks! Happy for this to be merged