Update dependency friendsofphp/php-cs-fixer to v3.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
friendsofphp/php-cs-fixer	require-dev	patch	3.15.0 -> 3.15.1

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Release Notes

PHP-CS-Fixer/PHP-CS-Fixer

### [`v3.15.1`](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/blob/HEAD/CHANGELOG.md#Changelog-for-v3151) [Compare Source](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/compare/v3.15.0...v3.15.1) - bug: BinaryOperatorSpacesFixer - fix for static in type ([#​6835](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6835)) - bug: BinaryOperatorSpacesFixer - fix parameters with union types passed by reference ([#​6826](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6826)) - bug: NoUnusedImportsFixer - fix for splat operator ([#​6836](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6836)) - DX: fix CI ([#​6837](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6837)) - feature: Support for type casing in arrow functions ([#​6831](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6831)) - minor: fix CI on PHP 8.3 ([#​6827](https://togithub.com/PHP-CS-Fixer/PHP-CS-Fixer/issues/6827))

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