Incorrect return type for `ResourceBundle::getLocales()`

[dtdesign]

Bug report

The return type of ResourceBundle::getLocales() is array|false, but PHPStan recognizes it as just array.

Code snippet that reproduces the problem

https://phpstan.org/r/6b4bfb74-1295-4764-9790-2f26c4a42084

Expected output

The possible false value needs to be recognized.

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[ondrejmirtes]

Has to be fixed in https://github.com/phpstan/phpstan-src/blob/2.1.x/resources/functionMap.php.

[github-actions]

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