scrypt dependency fails on node v12.12.0

[jooray]

When running npm install on node v12.12.0 macos, the install fails due to requiring deprecated scrypt package.

3670 verbose stack Error: scrypt@6.0.3 install: `node-gyp rebuild`
3670 verbose stack Exit status 1
3670 verbose stack     at EventEmitter.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
3670 verbose stack     at EventEmitter.emit (events.js:210:5)
3670 verbose stack     at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
3670 verbose stack     at ChildProcess.emit (events.js:210:5)
3670 verbose stack     at maybeClose (internal/child_process.js:1021:16)
3670 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
3671 verbose pkgid scrypt@6.0.3
3672 verbose cwd /Users/juraj/paralelnapolis/burner-wallet
3673 verbose Darwin 19.0.0
3674 verbose argv "/usr/local/Cellar/node/12.12.0/bin/node" "/usr/local/bin/npm" "uninstall" "scrypt"
3675 verbose node v12.12.0
3676 verbose npm  v6.13.1
3677 error code ELIFECYCLE
3678 error errno 1
3679 error scrypt@6.0.3 install: `node-gyp rebuild`
3679 error Exit status 1
3680 error Failed at the scrypt@6.0.3 install script.
3680 error This is probably not a problem with npm. There is likely additional logging output above.
3681 verbose exit [ 1, true ]

It is a known issue:
barrysteyn/node-scrypt#192

It will not be fixed upstream, because the package is no longer maintained:

If you are using scrypt.hash, it is now available natively in the Node.js crypto module.

If you are using scrypt.kdf / scrypt.verifyKdf, scrypt-kdf is a close-to-direct replacement.

We need to get rid of the dependency in order for burner wallet to work on recent systems.