Wrap heartbeat task in app executor

Author: rosa

lib/solid_queue/processes/registrable.rb

@@ -32,7 +32,10 @@ def registered?
       end
 
       def launch_heartbeat
-        @heartbeat_task = Concurrent::TimerTask.new(execution_interval: SolidQueue.process_heartbeat_interval) { heartbeat }
+        @heartbeat_task = Concurrent::TimerTask.new(execution_interval: SolidQueue.process_heartbeat_interval) do
+          wrap_in_app_executor { heartbeat }
+        end
+
         @heartbeat_task.execute
       end