Merge branch '5.4' into 6.3

* 5.4:
  Psalm: Ignore UnusedClass errors

Author: nicolas-grekas

Constraint.php

@@ -46,7 +46,7 @@ abstract class Constraint
 
     /**
      * Maps error codes to the names of their constants.
-     * 
+     *
      * @var array<string, string>
      */
     protected const ERROR_NAMES = [];