Add micromark-util-types as a dependency

[arcanis]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

Various type imports directly reference micromark-util-types:

micromark-extension-frontmatter/dev/lib/syntax.js

Lines 2 to 6 in 07a4d98

	* @typedef {import('micromark-util-types').Extension} Extension
	* @typedef {import('micromark-util-types').ConstructRecord} ConstructRecord
	* @typedef {import('micromark-util-types').Construct} Construct
	* @typedef {import('micromark-util-types').Tokenizer} Tokenizer
	* @typedef {import('micromark-util-types').State} State

Since it isn't listed in the dependencies, loose package managers like npm may generate incorrect hoisting (so TS would resolve the wrong version of micromark-util-types), and strict package managers like Yarn or pnpm may cause TS to fail to resolve the dependency.

This diff simply adds the missing dependency.

[arcanis]

The typecheck errors look unrelated to the PR itself 🤔

[wooorm]

This looks good, thanks! TS is indeed unrelated. I’ll get back to the repo in ±10 days as I’m on holiday. OK?

[wooorm]

Thanks, released in 1.0.1!