Add PHP 8.3 to release process doc; remove 7.4

Author: ramsey

docs/release-process.md

@@ -6,10 +6,10 @@ repository available according to the release schedule.
 The release schedule for each version is published on the
 [PHP wiki](https://wiki.php.net):
 
+- [PHP 8.3](https://wiki.php.net/todo/php83)
 - [PHP 8.2](https://wiki.php.net/todo/php82)
 - [PHP 8.1](https://wiki.php.net/todo/php81)
 - [PHP 8.0](https://wiki.php.net/todo/php80)
-- [PHP 7.4](https://wiki.php.net/todo/php74)
 
 The PHP project publishes builds every two weeks.