tools: update ESLint to 7.0.0

Update ESLint to 7.0.0

PR-URL: https://github.com/nodejs/node/pull/33316


Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>