chore: revert to lockfile v1

Updating to v2 fails in the CI on Node.js 12 & 14 with the following
error:

> npm ERR! Error while executing:
> npm ERR! /usr/bin/git ls-remote -h -t ssh://git@github.com/uNetworking/uWebSockets.js.git
> npm ERR!
> npm ERR! Warning: Permanently added the RSA host key for IP address '140.82.113.3' to the list of known hosts.
> npm ERR! git@github.com: Permission denied (publickey).
> npm ERR! fatal: Could not read from remote repository.
> npm ERR!
> npm ERR! Please make sure you have the correct access rights
> npm ERR! and the repository exists.
> npm ERR!
> npm ERR! exited with error code: 128

So we will revert the change for now.

Author: darrachequesne