Merge branch '5.0'

* 5.0:
  [Dotenv] Documentation improvement
  [DI] Clarified deprecation for TypedReference in 4.4
  [Validator] Add missing vietnamese translations
  add German translation
  add missing Messenger options to XML schema definition
  [5.0] Remove some unused variables
  [Validator][ConstraintValidator] Update wrong PRETTY_DATE doc
  [DomCrawler][Form] Fix PHPDoc on get & offsetGet
  [ErrorHandler] fix parsing static return type on interface method annotation (fix #35836)
  prevent method calls on null values
  Return int if scale = 0

Author: fabpot

Internal/HttplugWaitLoop.php

@@ -72,7 +72,7 @@ public function wait(?ResponseInterface $pendingResponse, float $maxDuration = n
                         goto check_duration;
                     }
 
-                    if ([$request, $promise] = $this->promisePool[$response] ?? null) {
+                    if ([, $promise] = $this->promisePool[$response] ?? null) {
                         unset($this->promisePool[$response]);
                         $promise->resolve($this->createPsr7Response($response, true));
                     }