take from your readme
CC BY 4.0
you currently have the media license set to cc-by-sa 3.0, this needs to be changed to cc-by-sa 4.0 to cover all work within this mod
disclaimer: not a lawyer and this is not legal advice
Done. The sound files were sourced so need to retain CC BY 4.0, but the art work is my own so has been changed to CC BY 4.0 as well.
you dont need to change the license of the files, the license displayed on contentdb needs to be changed