Doesn't support CJS on Node < v20.19.0

[timfish]

Because hook.mjs and hook-sync.mjs are ESM, this library only supports registerHooks via CJS in Node v20.19.0 or newer because require(esm) is required.

[jsumners-nr]

Seems not relevant to me:

1. We test on LTS versions:

   tracing-hooks/.github/workflows/ci.yml

   Line 12 in d71c592

   node-version: [20, 22, 24]

2. 20.20.2 was the last "LTS" version in the 20 line: https://nodejs.org/en/download/archive/v20.20.2

[timfish]

Until our next major is released we have to continue supporting Node v18

[jsumners-nr]

I'm a little confused. This module has never had support for Node.js v18.