Merge branch '5.4' into 6.0

* 5.4:
  Throw exception if incompatible version of psr/simple-cache is used
  [DependencyInjection] copy synthetic status when resolving child definitions
  [HttpClient] Fix Failed to open stream: Too many open files
  [Console] use STDOUT/ERR in ConsoleOutput to save opening too many file descriptors
  Fix for "Implicit conversion from float <float_number> to int loses precision"
  Fix typo in UPGRADE-6.0.md
  [Cache] Set mtime of cache files 1 year into future if they do not expire
  [DependencyInjection] remove arbitratry limitation to exclude inline services from bindings

Output/ConsoleOutput.php

@@ -149,14 +149,20 @@ private function openOutputStream()
             return fopen('php://output', 'w');
         }
 
-        return @fopen('php://stdout', 'w') ?: fopen('php://output', 'w');
+        // Use STDOUT when possible to prevent from opening too many file descriptors
+        return \defined('STDOUT') ? \STDOUT : (@fopen('php://stdout', 'w') ?: fopen('php://output', 'w'));
     }
 
     /**
      * @return resource
      */
     private function openErrorStream()
     {
-        return fopen($this->hasStderrSupport() ? 'php://stderr' : 'php://output', 'w');
+        if (!$this->hasStderrSupport()) {
+            return fopen('php://output', 'w');
+        }
+
+        // Use STDERR when possible to prevent from opening too many file descriptors
+        return \defined('STDERR') ? \STDERR : (@fopen('php://stderr', 'w') ?: fopen('php://output', 'w'));
     }
 }