Update NEWS and UPGRADING for __wakeup() deprecation of date classes

Author: Girgias

NEWS

@@ -25,6 +25,9 @@ PHP                                                                        NEWS
 - Date:
   . Fixed GH-17159: "P" format for ::createFromFormat swallows string literals.
     (nielsdos)
+  . The __wakeup() magic method of DateTimeInterface, DateTime,
+    DateTimeImmutable, DateTimeZone, DateInterval, and DatePeriod has been
+    deprecated in favour of the __unserialize() magic method. (Girgias)
 
 - Exif:
   . Fix OSS-Fuzz #442954659 (zero-size box in HEIF file causes infinite loop).

UPGRADING

@@ -417,6 +417,10 @@ PHP 8.5 UPGRADE NOTES
     deprecated. This is because the associated timezone is ignored and always
     uses GMT.
     RFC: https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_date_rfc7231_and_datetimeinterfacerfc7231
+  . The __wakeup() magic method of DateTimeInterface, DateTime,
+    DateTimeImmutable, DateTimeZone, DateInterval, and DatePeriod has been
+    deprecated in favour of the __unserialize() magic method.
+    Related to RFC: https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_the_sleep_and_wakeup_magic_methods
 
 - FileInfo:
   . The finfo_close() function has been deprecated.