[GIT-PULLS] [php-src] PR #22646: CI: fix encoding errors in iconv tests

[email protected] (LamentXU123)
Newsgroups php.git-pulls
Message-ID <AAo1MpJJja4U74HMhEzjujJ37Z4Be8UhSSdzZxNLhNg@main.internal.php.net>
Pull Request: https://github.com/php/php-src/pull/22646
Author: LamentXU123

Fix test failure on the master branch. e.g. https://github.com/php/php-src/actions/runs/28963159070/job/85939566851
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