Fix heartbeat configuration in bunny with 0 (off) value

When bunny doesn't see heartbeat key in bunnyConfig it set default value to 60 seconds.
So when one set hearbeat to zero, code ignore setting this key to bunnyConfig

Author: nightlinus

pkg/amqp-bunny/AmqpConnectionFactory.php

@@ -87,17 +87,14 @@ private function establishConnection(): BunnyClient
             $bunnyConfig['password'] = $this->config->getPass();
             $bunnyConfig['read_write_timeout'] = min($this->config->getReadTimeout(), $this->config->getWriteTimeout());
             $bunnyConfig['timeout'] = $this->config->getConnectionTimeout();
+            $bunnyConfig['heartbeat'] = $this->config->getHeartbeat();
 
             // @see https://github.com/php-enqueue/enqueue-dev/issues/229
 //            $bunnyConfig['persistent'] = $this->config->isPersisted();
 //            if ($this->config->isPersisted()) {
 //                $bunnyConfig['path'] = 'enqueue';//$this->config->getOption('path', $this->config->getOption('vhost'));
 //            }
 
-            if ($this->config->getHeartbeat()) {
-                $bunnyConfig['heartbeat'] = $this->config->getHeartbeat();
-            }
-
             if (null !== $this->config->getOption('tcp_nodelay')) {
                 $bunnyConfig['tcp_nodelay'] = $this->config->getOption('tcp_nodelay');
             }