missing news/upgrading entry

Author: krakjoe

NEWS

@@ -2,6 +2,9 @@ PHP                                                                        NEWS
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 ?? ??? ????, PHP 8.1.0alpha2
 
+- Core:
+  . Fixed bug #81163 (__sleep allowed to return non-array). (krakjoe)
+
 - Opcache:
   . Fixed bug #81133 (building opcache with phpize fails). (krakjoe)
   . Fixed bug #81136 (opcache header not installed). (krakjoe)

UPGRADING

@@ -312,6 +312,7 @@ PHP 8.1 UPGRADE NOTES
     e.g. a truncation from 1.9 to 1, is deprecated. This affects array keys,
     int parameter and return types, and operators working on integers.
     RFC: https://wiki.php.net/rfc/implicit-float-int-deprecate
+  . returning a non-array from __sleep will raise a warning
 
 - MySQLi:
   . The mysqli_driver::$driver_version property has been deprecated. The driver