troque a versao na url
https://cdn.jsdelivr.net/npm/wavesurfer.js@7/dist/wavesurfer.esm.js
https://cdn.jsdelivr.net/npm/wavesurfer.js@7/dist/plugins/hover.esm.js
https://cdn.jsdelivr.net/npm/wavesurfer.js@7/dist/plugins/record.esm.js