Update remark to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
remark-lint-first-heading-level (source)	3.1.2 → 4.0.1
remark-lint-heading-increment (source)	3.1.2 → 4.0.1

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Release Notes

remarkjs/remark-lint (remark-lint-first-heading-level)

v4.0.1

Compare Source

• Update docs (149a4a1)
• Update dev-dependencies (59ce8b5)

v4.0.0

Compare Source

• Add support for setting allowed file-name characters (fd908a4)
• Fix parameters when using reset (b8f52a9)
• Update list-item-spacing message (d562d6e)
• Fix checkbox lists starting with links (019ff36)

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