fix(deps): update dependency mdast-util-to-string to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mdast-util-to-string	3.2.0 → 4.0.0

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Release Notes

syntax-tree/mdast-util-to-string (mdast-util-to-string)

v4.0.0

Compare Source

Change

• 6f7f7cf Change to require Node.js 16
  migrate: update too
• f77cf68 Change to use export map
  migrate: don’t use private APIs

Full Changelog: syntax-tree/mdast-util-to-string@3.2.0...4.0.0

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