Fix Node 18 compatibility

[pyronaur]

There's an incompatibility with the Jetpack Monorepo with Node 18 that caused this:

pnpm i
Scope: all 68 workspace projects
Lockfile is up to date, resolution step is skipped
Packages: +2439
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Packages are hard linked from the content-addressable store to the virtual store.
  Content-addressable store is at: /Users/a14/Library/pnpm/store/v3
  Virtual store is at:             node_modules/.pnpm
../../../Library/pnpm/store/v3/tmp/_tmp_5764_9532727db424d5de852132277deb98cc [jetpack-boost-critical-css-gen@0.0.4]: Running npm-install script, failed in 763ms
...5764_9532727db424d5de852132277deb98cc npm-install$ npm install
│ npm ERR! code EBADENGINE
│ npm ERR! engine Unsupported engine
│ npm ERR! engine Not compatible with your version of node/npm: @es-joy/jsdoccomment@0.10.8
│ npm ERR! notsup Not compatible with your version of node/npm: @es-joy/jsdoccomment@0.10.8
│ npm ERR! notsup Required: {"node":"^12 || ^14 || ^16"}
│ npm ERR! notsup Actual:   {"npm":"8.19.3","node":"v18.13.0"}
│ npm ERR! A complete log of this run can be found in:
│ npm ERR!     /Users/a14/.npm/_logs/2023-01-25T17_30_59_353Z-debug-0.log
└─ Failed in 763ms at /Users/a14/Library/pnpm/store/v3/tmp/_tmp_5764_9532727db424d5de852132277deb98cc
 ERR_PNPM_PREPARE_PACKAGE  Failed to prepare git-hosted package fetched from "https://codeload.github.com/automattic/jetpack-boost-critical-css-gen/tar.gz/91e0ed5e0cf6296fd06f525d1fc016d5d46af86f": jetpack-boost-critical-css-gen@0.0.4 npm-install: `npm install`
Exit status 1
Progress: resolved 2439, reused 2315, downloaded 0, added 144

npm why points to an outdated eslint-plugin-jsdoc dependency that's no longer compatible with Node 18:

npm why @es-joy/jsdoccomment@0.20.1
@es-joy/jsdoccomment@0.20.1 dev
node_modules/@wordpress/eslint-plugin/node_modules/@es-joy/jsdoccomment
  @es-joy/jsdoccomment@"~0.20.1" from eslint-plugin-jsdoc@37.9.7
  node_modules/@wordpress/eslint-plugin/node_modules/eslint-plugin-jsdoc
    eslint-plugin-jsdoc@"^37.0.3" from @wordpress/eslint-plugin@13.9.0
    node_modules/@wordpress/eslint-plugin
      dev @wordpress/eslint-plugin@"^13.9.0" from the root project

Overriding the version for now until we figure out a better way to deal with this.