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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-frontmatter	^4.0.1 -> ^5.0.0

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Release Notes

remarkjs/remark-frontmatter (remark-frontmatter)

v5.0.0

Compare Source

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

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