deps: update acorn to v7.1.1

Also clean up the plugins package.json files.

PR-URL: https://github.com/nodejs/node/pull/32310


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>