It’s not possible for you to upgrade the copy of FontAwesome inside Panorama. However, you could always install FontAwesome yourself on your computer. Then it would be available for all your applications, not just Panorama.
Panorama X currently includes FontAwesome version 4. The latest version is version 5, which was a very major upgrade. It was such a major upgrade that I have hesitated to install it in Panorama X, since I’ll want to do some extensive testing that this upgrade doesn’t break anything.
Also, there are now two versions of FontAwesome 5, the free version and the Pro version. which has a paid license. The free version will definitely be included in Panorama X at some point assuming that I don’t find some major problem in testing. ProVUE owns a paid license for the Pro version, but I’m not sure if that license allows it to be included in Panorama or not. I think it might, but obviously I want to be absolutely sure before moving forward with that.
I’m mentioning this because it’s possible that the icons you are interested in may only be in the Pro version. So I can’t say for sure if the icons you are particularly interested in will ever be available or not.