test: update wpt tests for encoding

Refs: https://github.com/web-platform-tests/wpt/pull/25542

PR-URL: https://github.com/nodejs/node/pull/35330


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>