PHP 8.5 deprecates the `__sleep()` and `__wakeup()` magic methods in favor of `__serialize()` and `__unserialize()`:
> `Deprecated: The __wakeup() serialization magic method has been deprecated. Implement __unserialize() instead (or in addition, if support for old PHP versions is necessary)`
For PHP < 7.4 compatibility, `__sleep()` and `__wakeup()` need to be kept for the time being.
This commit moves the logic of `__wakeup()` methods in core to `__unserialize()`, and turns the former into wrappers. WordPress core does not use `__sleep()` methods, so these are the only changes required.
Reference: [https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_the_sleep_and_wakeup_magic_methods PHP RFC: Deprecations for PHP 8.5: Deprecate the __sleep() and __wakeup() magic methods].
Follow-up to [56835], [60787], [60795].
Props TobiasBg, tusharbharti, swissspidy, dmsnell, SergeyBiryukov.
Fixes#63962. See #63061.
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