syncing idna to 0.5.5

[lemire]

This version uses more modern code (C++20).

[codecov]

Codecov Report

❌ Patch coverage is 40.90909% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.81%. Comparing base (9463d20) to head (8e1cccc).

Files with missing lines	Patch %	Lines
src/ada_idna.cpp	40.90%	2 Missing and 11 partials ⚠️

❌ Your patch check has failed because the patch coverage (40.90%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1149      +/-   ##
==========================================
- Coverage   59.87%   59.81%   -0.06%     
==========================================
  Files          37       37              
  Lines        6133     6127       -6     
  Branches     2978     2978              
==========================================
- Hits         3672     3665       -7     
  Misses        617      617              
- Partials     1844     1845       +1     

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[anonrig]

fuzzer seems to be failing