Merge branch '4.4' into 5.4

* 4.4:
  Use mb_convert_encoding instead of utf8_decode
  [FrameworkBundle] Always add CacheCollectorPass
  Fix "Notice: Undefined index: headers" in messenger with Oracle
  Indicate support for doctrine/persistence 3
  Replace deprecated String.prototype.substr()

Author: derrabus

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=7.2.5",
         "doctrine/event-manager": "~1.0",
-        "doctrine/persistence": "^2",
+        "doctrine/persistence": "^2|^3",
         "symfony/deprecation-contracts": "^2.1|^3",
         "symfony/polyfill-ctype": "~1.8",
         "symfony/polyfill-mbstring": "~1.0",