Fix prefer-stable negative result in ghtar

[crazywhalecc]

What does this PR do?

Fix prefer-stable negative result in ghtar

Checklist before merging

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• If it's an extension or dependency update, make sure adding related extensions in src/global/test-extensions.php.
• If you changed the behavior of static-php-cli, update docs in ./docs/.
• If you updated config/xxx.json content, run bin/spc dev:sort-config xxx.