chore: downgrade npm to v6 and regenerate package-lock

[straker]

npm v7 causes a multitude of problems, namely that we can't run npm ci for the release script since it uses ssh protocol for all dependencies to read from it, which fails if you don't have ssh permissions.

 npm ci 
npm WARN prepare removing existing node_modules/ before installation
npm ERR! Error while executing:
npm ERR! /usr/bin/git ls-remote -h -t ssh://git@github.com/act-rules/act-rules.github.io.git
npm ERR!
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
npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/stevenlambert/.npm/_logs/2021-06-17T15_33_48_646Z-debug.log

I had to downgrade to npm v6 and then delete package-lock.json and regenerate it to solve the issue.

See npm/cli#2610
See npm/cli#3284

This pr replaces #2996 and includes updated dependencies as well since i regenerated the package-lock file. I hate that we have to downgrade chromedriver from @latest to v90 as well, but CircleCI hasn't updated it's version of chrome to v91 and we really need this merged to do the release.