Merge branch '5.4' into 6.0

* 5.4:
  [Security] Do not overwrite already stored tokens for REMOTE_USER authentication
  [Validator] Fix validation for single level domains
  [Notifier] add Vonage bridge to replace the Nexmo one
  Fix redundant type casts
  Increased the reserved memory from 10k to 32k
  Complete event name & dispatcher in EventDispatcherDebugCommand
  [DoctrineBridge] Add DbalLoggerTest to group legacy
  Leverage DBAL's getNativeConnection() method
  [FrameworkBundle] Fix property-info phpstan extractor discovery
  Fix idempotency of LocoProvider write method

Author: nicolas-grekas

Adapter/ExtLdap/Adapter.php

@@ -67,7 +67,7 @@ public function escape(string $subject, string $ignore = '', int $flags = 0): st
         $value = ldap_escape($subject, $ignore, $flags);
 
         // Per RFC 4514, leading/trailing spaces should be encoded in DNs, as well as carriage returns.
-        if ((int) $flags & \LDAP_ESCAPE_DN) {
+        if ($flags & \LDAP_ESCAPE_DN) {
             if (!empty($value) && ' ' === $value[0]) {
                 $value = '\\20'.substr($value, 1);
             }