Snyk Vulnerability - Update xlsx

[ymoreiratiti]

Upgrade xlsx package version. The current version has a Snyk Vulnerability: https://security.snyk.io/package/npm/xlsx

https://github.com/DiegoZoracKy/convert-excel-to-json/blob/master/package.json#L29

[NoNameProvided]

There is no update available to the xlsx package on NPM anymore (reference). This package can do two things:

• either vendor in the package from their private CDN as suggested
• switch to https://www.npmjs.com/package/xlsx-republish which is an automatically republished version of the package