Really, almost any digital camera can be used for photographing holiday lights. The primary things you'll want are a camera with the ability to change shooting/exposure modes, and to make settings like raising or lowering ISOs. The ability to alter White Balance (the overall color "tint" of your pictures) can be very handy when you're photographing not only subjects lit by artificial lights, but the lights themselves.
Some recently-introduced cameras now have Electronic Viewfinders (sometimes abbreviated "EVF"), and these have some nice advantages when it comes to photos or video recording in dimly-lit situations. First, they can often raise the overall brightness of the scene you're looking at, making it easier to see and compose your images, even when most of the scene is in deep shadow. And secondly, you can see a good approximation of the brightness and the color rendition you'll likely get in your pictures, right in the EVF, before you take the first picture. And if you decide to change a setting like White Balance, you'll see the shift in color immediately after you've set it. So while photographers have taken great pictures of holiday lights for decades using traditional "optical" viewfinders, you'll likely find your success rate goes up a bit if you use a modern mirrorless camera, or a compact digital camera which has an electronic viewfinder.
While the intent of this article is not to act as a sales pitch, the recently-introduced Canon EOS R camera is outstanding in both viewing and focusing in low-light situations, arguably among the best cameras in the industry for this type of work. If you enjoy this type of low-light work, the next time you're camera shopping, you should take a look at this full-frame, mirrorless Canon EOS camera.