Fix NEWS placeholder for the next version

This aligns with the PHP-7.4 and PHP-7.3 branches, and should
fix the `sgolemon/php-release` script run for releasing 8.0.2.

Author: carusogabriel

NEWS

@@ -1,6 +1,6 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-?? ??? ????, PHP 8.0.2RC1
+?? ??? 2021, PHP 8.0.2
 
 - Core:
   . Fixed bug #80523 (bogus parse error on >4GB source code). (Nikita)