proper cleanup for destructed connections

Author: transistive

src/Bolt/BoltConnection.php

@@ -378,7 +378,7 @@ public function getDriverConfiguration(): DriverConfiguration
 
     public function __destruct()
     {
-        if ($this->isOpen()) {
+        if ($this->serverState !== 'FAILED' && $this->isOpen()) {
             $this->close();
         }
     }