chore: Use `node:` protocol in imports (`require(…)`)

[Zearin]

(Note: This PR is a companion to 11ty/webc#168)

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The official docs have used the prefix in examples for years.

According to the NodeJS docs for Modules (§Core Modules), the node: “protocol” was added in:

• NodeJS v16.0.0 (initial release 2021-04-20; source) and
• (probablypossibly experimentally…?) v14.18.0 (released 2021-09-08; source)

Personally, I like how it makes it easy to distinguish:

• 3rd party modules (no prefix) from
• core modules (node: prefix) and
• local modules (./ or ../ prefix).

[zachleat]

I haven’t found this to work in Node 14, which is our current Node minimum for a bit longer!

[Zearin]

Okay, thanks! 🙏🏽