Bumped version after 4.0.3 release (#96)

Author: mnocon

src/contracts/Ibexa.php

@@ -13,5 +13,5 @@ final class Ibexa
     /**
      * Ibexa DXP Version.
      */
-    public const VERSION = '4.0.3';
+    public const VERSION = '4.0.4';
 }