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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@eslint/markdown	^6.4.0 -> ^7.0.0

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Release Notes

eslint/markdown (@​eslint/markdown)

v7.0.0

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⚠ 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)

v6.6.0

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Features

• add checkSiblingsOnly option to no-duplicate-headings rule (#​393) (2512729)
• add JSON frontmatter support (#​411) (8b77e69)
• add no-bare-urls rule (#​418) (5149927)
• add no-missing-link-fragments rule (#​380) (70e7dac)
• add no-reversed-media-syntax rule (#​398) (ae547ab)
• update no-multiple-h1 rule to recognize JSON frontmatter (#​413) (33dda18)

Bug Fixes

• ensure ATX headings follow spec for space after hash characters (#​421) (bab9670)

v6.5.0

Compare Source

Features

• add no-missing-atx-heading-space rule (#​371) (84c87c4)
• add no-empty-definitions rule (#​364) (cb5a956)
• add no-multiple-h1 rule (#​377) (d7c88e8)
• add require-alt-text rule (#​368) (32d8cbd)
• added new rule table-column-count (#​392) (c685139)
• create no-duplicate-definitions (#​360) (18c7d77)
• create no-empty-images (#​357) (23e4ff0)

Bug Fixes

• no-invalid-label-refs do not report correct position (#​366) (ed01747)
• no-missing-label-refs rule does not respect escaping (#​348) (cb6b437)
• update require-alt-text rule to ignore commented images (#​385) (b2fc801)

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