refactor: prefix built-in node module imports

[Phillip9587]

Align with changes introduced in expressjs/express#6236 by prefixing all built-in Node.js module imports with 'node:'.

Reference: expressjs/express#6236

Taken from that PR:

Since v5 relies on node >= 18, this is now possible (since v16, v14.18.0 12).

It's functionally irrelevant:

1. It's not required for CJS nor ESM (with a few exceptions 3)
2. It has no performance promises

However, there are upsides to this approach:

1. It brings clear boundaries to what's a built-in and what's an external dependency
2. It reduces the risk of importing unwanted deps where a built-in is expected
3. It's slightly more interoperable with other JS runtimes that provide node compatibility4, albeit only during development. Once imported from npm, built-ins are assumed.

Footnotes

1. https://nodejs.org/docs/latest-v22.x/api/modules.html#built-in-modules↩
2. module: add support for node:‑prefixed require(…) calls nodejs/node#37246↩
3. https://nodejs.org/api/modules.html#built-in-modules-with-mandatory-node-prefix↩
4. https://docs.deno.com/runtime/fundamentals/node/#using-node's-built-in-modules↩