I would say it's not a problem unless you are hearing these noises at different times other than feeding.
Your snakes food item will always be larger than the snakes mouth, so it is constantly squeezing the food to compress it during swallowing. I hear all kinds of gurgling/squeaking from random snakes during feeding. Also sometimes depending on the angle the snake is laying, their breathing tube may be partially blocked for a minute or two and you will hear funny noises.