Merge branch '4.4' into 5.2

* 4.4:
  fixed parser
  Fixed bugs found by psalm
  [FrameworkBundle] Dont store cache misses on warmup
  [Cache] skip storing failure-to-save as misses in ArrayAdapter
  [Validator] Delete obsolete statement in Regex::getHtmlPattern() phpDoc
  [FrameworkBundle] Remove author comments for configuration and extension
  [DependencyInjection] Fix "url" env var processor behavior when the url has no path
  Fixed support for nodes not extending BaseNode
  add missing queue_name to find(id) in doctrine messenger transport
  [Serializer] AbstractNormalizer force null for non-optional nullable constructor parameter denormalization when not present in input

Author: nicolas-grekas

Request.php

@@ -1600,7 +1600,7 @@ public function toArray()
      */
     public function getETags()
     {
-        return preg_split('/\s*,\s*/', $this->headers->get('if_none_match'), null, \PREG_SPLIT_NO_EMPTY);
+        return preg_split('/\s*,\s*/', $this->headers->get('if_none_match'), -1, \PREG_SPLIT_NO_EMPTY);
     }
 
     /**