fixing up deidentify signature

[tclose]

Fixing up deidentify signature so that out_dir is not optional

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.40%. Comparing base (1bddcda) to head (7d01b63).

❗ There is a different number of reports uploaded between BASE (1bddcda) and HEAD (7d01b63). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (1bddcda)	HEAD (7d01b63)
	4	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #5       +/-   ##
===========================================
- Coverage   88.13%   64.40%   -23.73%     
===========================================
  Files           4        4               
  Lines          59       59               
===========================================
- Hits           52       38       -14     
- Misses          7       21       +14     

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