Merge branch '5.4' into 6.0

* 5.4:
  [DoctrineBridge] Remove dead code
  [Lock] Remove unused variable
  [DoctrineBridge] Replace string with FQCN resolution in EntityType
  Add missing `@return $this` annotations
  [Notifier] Add missing types to SmscTransport

Author: nicolas-grekas

Compiler.php

@@ -41,6 +41,9 @@ public function getSource(): string
         return $this->source;
     }
 
+    /**
+     * @return $this
+     */
     public function reset()
     {
         $this->source = '';