Revert "chore(deps): update dependency marked to v6"

[JoshuaKGoldberg]

Reverts #7422

In packages/eslint-plugin/tests/docs.test.ts:

The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import("marked")' call instead.
  To convert this file to an ECMAScript module, change its file extension to '.mts' or create a local package.json file with `{ "type": "module" }`.ts(1479)
module "/Users/josh/repos/typescript-eslint/node_modules/marked/lib/marked"

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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