Revert "ext/date: Deprecate __wakeup() methods in favour of __unserialize() (#19827)"

This reverts commit 4fbd248.

Author: nicolas-grekas

ext/date/php_date.stub.php

@@ -323,7 +323,6 @@ public function getMicrosecond(): int;
     public function diff(DateTimeInterface $targetObject, bool $absolute = false): DateInterval;
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void;
 
     public function __serialize(): array;
@@ -340,7 +339,6 @@ public function __serialize(): array {}
     public function __unserialize(array $data): void {}
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     /** @tentative-return-type */
@@ -458,7 +456,6 @@ public function __serialize(): array {}
     public function __unserialize(array $data): void {}
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     /** @tentative-return-type */
@@ -635,7 +632,6 @@ public function __serialize(): array {}
     public function __unserialize(array $data): void {}
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     /** @tentative-return-type */
@@ -662,7 +658,6 @@ public function __serialize(): array;
     public function __unserialize(array $data): void;
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     /** @tentative-return-type */
@@ -739,7 +734,6 @@ public function __serialize(): array;
     public function __unserialize(array $data): void;
 
     /** @tentative-return-type */
-    #[\Deprecated(since: '8.5', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     /** @tentative-return-type */