tools: update ESLint to 7.6.0

Update ESLint to 7.6.0

PR-URL: https://github.com/nodejs/node/pull/34589


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>