fix(deps): update dependency mdast-util-to-markdown to v2.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mdast-util-to-markdown	2.1.1 -> 2.1.2

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Release Notes

syntax-tree/mdast-util-to-markdown (mdast-util-to-markdown)

### [`v2.1.2`](https://redirect.github.com/syntax-tree/mdast-util-to-markdown/releases/tag/2.1.2) [Compare Source](https://redirect.github.com/syntax-tree/mdast-util-to-markdown/compare/2.1.1...2.1.2) - [`b0a91ea`](https://redirect.github.com/syntax-tree/mdast-util-to-markdown/commit/b0a91ea) Fix crash in more complex content around attention **Full Changelog**: https://github.com/syntax-tree/mdast-util-to-markdown/compare/2.1.1...2.1.2

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This PR will trigger a patch release when merged.

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:tada: This PR is included in version 4.0.8 :tada:

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