Update dependency remark-gfm to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-gfm	^3.0.1 -> ^4.0.0

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Release Notes

remarkjs/remark-gfm (remark-gfm)

v4.0.0

Compare Source

Change

• b8cc334 Update @types/mdast, unified, utilities
  migrate: update too
• 9eb0f54 Change to use exports
  migrate: don’t use private APIs
• 5715c93 Change to require Node.js 16
  migrate: update too

Full Changelog: remarkjs/remark-gfm@3.0.1...4.0.0

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