Issue #3446936 by xjm, longwave: Recommend PHP 8.3 in Drupal 10.3

(cherry picked from commit 28035aa5)

core/lib/Drupal.php

@@ -131,7 +131,7 @@ class Drupal {
    * message, but Drupal can still be installed. Used for (e.g.) PHP versions
    * that have reached their EOL or will in the near future.
    */
-  const RECOMMENDED_PHP = '8.2.0';
+  const RECOMMENDED_PHP = '8.3.0';
 
   /**
    * The currently active container object, or NULL if not initialized yet.