Change dependencies

[carson2222]

Lab excercise works well, but when you try to complete the Challenge there comes the problem. Structure of the json/ts IDL generated by the newest Anchor version 0.30.1 is different that the one accepted by AnchorProvider from "@project-serum/anchor". I just changed the "@project-serum/anchor" to "@coral-xyz/anchor", since the project-serum's one was not updated yet.

Hope you can fix it so other course members won't get confused. :)