[BUG]: Classes that implement Serializable have wrong function declaration

[noone-silent]

Describe the bug
For example the \Phalcon\Mvc\Model class implements \Serializable. This class is defined as:

interface Serializable {
    public serialize(): ?string
    public unserialize(string $data): void
}

The \Phalcon\Mvc\Model has it implemented like this:

public function serialize() -> string
public function unserialize(var data)

Expected behavior
Follow the interface definition.

Details

• Phalcon version: 5.6.2
• PHP Version: 8.2
• Operating System: debian
• Installation type: installing via package manager
• Zephir version (if any): 0.17.0
• Server: Nginx
• Other related info (Database, table schema): none

[niden]

Resolved in #16592

Thank you again @noone-silent