I had the same issue on a 2013 (03/13 manufacture date) around 19k miles. The sound is always much worse in hot weather, especially here in Texas.
Took it to dealer (different from the dealer I purchased from since I now live in a different city) and they wanted to replace the master cylinder. It was clear to me they were just cheaping out on the warranty work fix but I didn't fight it. Clutch squeaked again when I started the car in the service bay so I left it another day, but when the mechanic tested it (in the early morning when it was still cool outside)and it didn't squeak, they gave it back and said they'd make a note in the car's file that I still think there's an issue.
I decided to stop wasting time with it unless there was an actual problem shifting. 10k miles later no problems but the noise is still irritating. My recommendation to anyone who wants to get it fixed is take it when the weather is warmer and the car is warm so the noise is more easily reproducible. I'm moving back near my purchase dealer in the summer, so I think I might try again, because what better way to spend a lovely summer day than fighting for warranty work with your dealership?
