chore: bump up marked version to v18

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
marked (source)	^17.0.0 → ^18.0.0

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Release Notes

markedjs/marked (marked)

v18.0.6

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v18.0.5

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Bug Fixes

• parse empty list item with trailing space (#​3984) (b55410f)

v18.0.4

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Bug Fixes

• cache list indentation regexes (#​3969) (a37983f)
• fix cli not reading stdin (#​3967) (11adb69)

v18.0.3

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Bug Fixes

• avoid task checkbox for setext heading text (#​3960) (2608e81)

v18.0.2

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Bug Fixes

• fix infinite loop for indented code blank line (#​3947) (58a52e8)

v18.0.1

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Bug Fixes

• rules: ensure lookbehind regex is evaluated correctly by minifiers (#​3945) (abd907a)

v18.0.0

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Bug Fixes

• Bump typescript from 5.9.3 to 6.0.2 (#​3934) (e8efc51)
• prevent GFM table tokens from greedily capturing trailing newlines (#​3926) (40f2665)
• prevent heading and def tokens from greedily capturing multiple newlines (#​3925) (b379e3e)
• trim blank lines from block tokens (#​3939) (b70895f)

BREAKING CHANGES

• trim trailing blank lines from block tokens
• update Typescript to v6

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