Missing/outdated build dependencies

[tifrel]

As stated in the comment. I get problems when building the canvas UI locally, from building electron:

HTTPError: Response code 404 (Not Found) for https://github.com/electron/electron/releases/download/v9.4.1/electron-v9.4.1-darwin-arm64.zip

And also for deasync, about node-gyp not being available, and interestingly couldn't fix it by installing node-gyp globally.

Gonna do a PR with updated deps. (Update: #112)