Bump Symfony version to 6.3.0

Author: fabpot

Diff for: Kernel.php

@@ -76,12 +76,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
      */
     private static array $freshCache = [];
 
-    public const VERSION = '6.3.0-RC1';
+    public const VERSION = '6.3.0-DEV';
     public const VERSION_ID = 60300;
     public const MAJOR_VERSION = 6;
     public const MINOR_VERSION = 3;
     public const RELEASE_VERSION = 0;
-    public const EXTRA_VERSION = 'RC1';
+    public const EXTRA_VERSION = 'DEV';
 
     public const END_OF_MAINTENANCE = '01/2024';
     public const END_OF_LIFE = '01/2024';