Merge branch '4.4' into 5.0

* 4.4:
  [appveyor] bump cache
  [Twig][Mime] Removed extra quotes in missing package exception message
  [DI] µfix
  Allowing empty secrets to be set
  [DI] add missing property declarations in InlineServiceConfigurator
  [DI] fix detecting short service syntax in yaml
  Supress error from fread when reading a unix pipe
  [HttpClient] Fix scoped client without query option configuration
  [Workflow] Use a strict comparison when retrieving raw marking in MarkingStore
  [Workflow] Use a strict comparison when retrieving raw markin in MarkingStore

Author: nicolas-grekas

Pipes/UnixPipes.php

@@ -118,7 +118,7 @@ public function readAndWrite(bool $blocking, bool $close = false): array
             $read[$type = array_search($pipe, $this->pipes, true)] = '';
 
             do {
-                $data = fread($pipe, self::CHUNK_SIZE);
+                $data = @fread($pipe, self::CHUNK_SIZE);
                 $read[$type] .= $data;
             } while (isset($data[0]) && ($close || isset($data[self::CHUNK_SIZE - 1])));