Bump Symfony version to 5.3.12

Author: fabpot

Kernel.php

@@ -75,12 +75,12 @@ abstract class Kernel implements KernelInterface, RebootableInterface, Terminabl
 
     private static $freshCache = [];
 
-    public const VERSION = '5.3.11';
-    public const VERSION_ID = 50311;
+    public const VERSION = '5.3.12-DEV';
+    public const VERSION_ID = 50312;
     public const MAJOR_VERSION = 5;
     public const MINOR_VERSION = 3;
-    public const RELEASE_VERSION = 11;
-    public const EXTRA_VERSION = '';
+    public const RELEASE_VERSION = 12;
+    public const EXTRA_VERSION = 'DEV';
 
     public const END_OF_MAINTENANCE = '01/2022';
     public const END_OF_LIFE = '01/2022';