test: update wpt test for encoding

[Nahee-Park]

Updating the web platform tests for the encoding.

[nodejs-github-bot]

Review requested:

• [ ] @nodejs/web-standards

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.23%. Comparing base (e32521a) to head (e176336). Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #55151      +/-   ##
==========================================
- Coverage   88.24%   88.23%   -0.01%     
==========================================
  Files         651      651              
  Lines      183930   183930              
  Branches    35850    35845       -5     
==========================================
- Hits       162311   162295      -16     
+ Misses      14918    14914       -4     
- Partials     6701     6721      +20     

see 22 files with indirect coverage changes

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/62828/

[nodejs-github-bot]

Landed in 371ed85e4e1d02c63227d17f226e5301f4a8ef61