fix(deps): update dependency @eslint/markdown to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@eslint/markdown	6.6.0 -> 7.0.0

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Release Notes

eslint/markdown (@​eslint/markdown)

v7.0.0

Compare Source

⚠ BREAKING CHANGES

• move certain types to import them from @eslint/markdown/types (#​446)
• set no-missing-link-fragments default ignoreCase to true (#​447)
• remove rollup and extraneous types (#​383)

Features

• add allowDefinitions & allowFootnoteDefinitions opts to no-empty-definitions (#​455) (e09eba6)
• add checkFootnoteDefinitions option to no-empty-definitions (#​442) (4d504e5)
• create no-unused-definitions rule (#​425) (6b43333)
• set no-missing-link-fragments default ignoreCase to true (#​447) (925191e)

Bug Fixes

• handle URL-encoded link fragments in no-missing-link-fragments rule (#​437) (76685c5)
• move certain types to import them from @eslint/markdown/types (#​446) (0dc6220)
• remove rollup and extraneous types (#​383) (e7ccd2e)
• skip HTML nodes in heading slugs for no-missing-link-fragments (#​445) (e4dcf6a)
• update no-duplicate-headings to align with CommonMark spec (#​438) (2bc0a38)

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