symfony/http-kernel v6.4.0-BETA3

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Changelog (v6.4.0-BETA2...v6.4.0-BETA3)

• bug symfony/symfony#52488 [HttpKernel] Fix PHP deprecation (@nicolas-grekas)
• feature symfony/symfony#52471 [HttpKernel] Add ControllerResolver::allowControllers() to define which callables are legit controllers when the _check_controller_is_allowed request attribute is set (@nicolas-grekas)
• bug symfony/symfony#52428 [HttpKernel] Preventing error 500 when function putenv is disabled (@ShaiMagal)