Merge branch '5.2' into 5.x

* 5.2:
  Dont allow unserializing classes with a destructor
  Dont allow unserializing classes with a destructor - 4.4
  [Cache] fix possible collision when writing tmp file in filesystem adapter
  a colon followed by spaces exclusively separates mapping keys and values
  Contracts: Remove ellipsis
  fix handling float-like key attribute values
  Fix transient test with HttpClient jitter
  Fix missing BCC recipients in SES bridge
  Move AuthenticationSuccessEvent outside try/catch block
  Dont allow unserializing classes with a destructor - 5.2
  Dont allow unserializing classes with a destructor - 5.1

Author: nicolas-grekas

Lock.php

@@ -49,6 +49,16 @@ public function __construct(Key $key, PersistingStoreInterface $store, float $tt
         $this->logger = new NullLogger();
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     /**
      * Automatically releases the underlying lock when the object is destructed.
      */