chore(deps): update dependency remark-frontmatter to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-frontmatter	^2.0.0 -> ^5.0.0

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Release Notes

remarkjs/remark-frontmatter (remark-frontmatter)

v5.0.0

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Change

• cf244cd Update @type/mdast, unified, utilities
  migrate: update too
• 813df9f Change to use exports
  migrate: don’t use private APIs
• 2eb2310 Change to require Node.js 16
  migrate: update too

Full Changelog: remarkjs/remark-frontmatter@4.0.1...5.0.0

v4.0.1

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• b56dae7 Add improved docs
  by @​wooorm in https://github.com/remarkjs/remark-frontmatter/pull/17

Full Changelog: remarkjs/remark-frontmatter@4.0.0...4.0.1

v4.0.0

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• c02f672 Use ESM

  // From CommonJS
  var remarkFrontmatter = require('remark-frontmatter')
  
  // To ESM
  import remarkFrontmatter from 'remark-frontmatter'

  Learn more about ESM in this guide
• 3f125a9 Add JSDoc based types

v3.0.0

Compare Source

• fb1357b Update for micromark in remark@13
  (breaking, this update will not work for remark lower than v13, see commit for changes)

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