Nah. Dry hopping is dry hopping. It’s done directly in fermenters every day in beer without issues and I’d put money your cider will have a higher ABV than many, if not most, of those beers. Between the alcohol content of the cider, and the antiseptic properties of the hops, your risk is minuscule to non existent.
If you plan on bagging your hops, you can sanitize the bag with star San first, but that’s about it.