webidl: access keys in lexicographical order

[KhafraDev]

refs nodejs/node#61980

[KhafraDev]

npm issues? All of the failing runs are giving similar errors to

npm error code E403
npm error 403 403 Forbidden - GET https://registry.npmjs.org/@babel%2fhelper-compilation-targets
npm error 403 In most cases, you or one of your dependencies are requesting
npm error 403 a package version that is forbidden by your security policy, or
npm error 403 on a server you do not have access to.
npm error A complete log of this run can be found in: C:\npm\cache\_logs\2026-02-25T18_50_58_136Z-debug-0.log

(for multiple packages, not just this one)

[Ethan-Arrowood]

yes, npm was down earlier today.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.14%. Comparing base (088f72c) to head (3d95c4a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4841      +/-   ##
==========================================
- Coverage   93.15%   93.14%   -0.02%     
==========================================
  Files         109      109              
  Lines       34228    34231       +3     
==========================================
- Hits        31884    31883       -1     
- Misses       2344     2348       +4     

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