(Darwin) Fix leaks on setting unsupported cipher pref

[xiazhvera]

Issue #, if available:

Description of changes:

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.75%. Comparing base (db7a1bd) to head (9b65281).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #757      +/-   ##
==========================================
+ Coverage   78.74%   78.75%   +0.01%     
==========================================
  Files          30       30              
  Lines        6403     6403              
==========================================
+ Hits         5042     5043       +1     
+ Misses       1361     1360       -1     

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