Don't trim it, move it out a little bit. If you trim it, you might chip the finish or end up with an uneven edge that will bug you for years. But if you pull out the dishwasher to see how the side panel is attached to the countertop then you may be able to unscrew a couple of brackets, move the top just 1/8" and screw it back. There's a good chance this will be enough and you won't have to also move the bottom. But if you need to, then pull out the quarter rounds, try to gently tap the bottom to move that out as well; it might just move enough to give you the clearance you need.