Merge branch '4.4' into 5.3

* 4.4:
  [HttpClient] Remove deprecated usage of `GuzzleHttp\Promise\queue`
  [PropertyAccess] Fix handling of uninitialized property of anonymous class
  [DependencyInjection] fix test
  ResolveBindingsPass remove loading of class iterable
  [FrameworkBundle] Avoid calling rtrim(null, '/') in AssetsInstallCommand
  [DependencyInjection] Fix nested env var with resolve processor
  Allow OutputFormatter::escape() to be used for escaping URLs used in <href>
  allow a zero time-limit
  [DependencyInjection] Ignore argument type check in CheckTypeDeclarationsPass if it's a Definition with a factory
  [Validators] Add translations for Slovak #43735

Author: nicolas-grekas

Command/AssetsInstallCommand.php

@@ -96,8 +96,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
     {
         /** @var KernelInterface $kernel */
         $kernel = $this->getApplication()->getKernel();
-        $targetArg = rtrim($input->getArgument('target'), '/');
-
+        $targetArg = rtrim($input->getArgument('target') ?? '', '/');
         if (!$targetArg) {
             $targetArg = $this->getPublicDirectory($kernel->getContainer());
         }