Retract smithy4s 0.18.40

[kubukoz]

disneystreaming/smithy4s#1792

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.75%. Comparing base (5dadd4f) to head (f0d460d).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3678   +/-   ##
=======================================
  Coverage   89.75%   89.75%           
=======================================
  Files         174      174           
  Lines        5048     5048           
  Branches      487      487           
=======================================
  Hits         4531     4531           
  Misses        517      517           

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[kubukoz]

Thanks @mzuehlke 🙏