Merge branch '6.2' into 6.3

* 6.2:
  fix style of label containing new lines in PUML dump
  [TwigBridge] Allow floats in html5 input type number field
  [Translation] Handle the translation of empty strings
  [VarDumper] Fix error when reflected class has default Enum parameter in constructor
  [FrameworkBundle] Fix denyAccessUnlessGranted for mixed attributes
  [Validator] Fix translation of AtLeastOneOf constraint message
  do not drop embed label classes
  [Validator] Sync IBAN formats with Swift IBAN registry
  Update Infobip API transport to use the API V3
  [String] Use same alphabet for ByteString::fromRandom tests
  Fix phpdocs in components
  Fix the rendering of query explanation with Postgresql

Author: nicolas-grekas

Process.php

@@ -874,7 +874,7 @@ public function getStatus(): string
      * Stops the process.
      *
      * @param int|float $timeout The timeout in seconds
-     * @param int       $signal  A POSIX signal to send in case the process has not stop at timeout, default is SIGKILL (9)
+     * @param int|null  $signal  A POSIX signal to send in case the process has not stop at timeout, default is SIGKILL (9)
      *
      * @return int|null The exit-code of the process or null if it's not running
      */