fix(deps): update dependency remark-mdx to ^2.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-mdx (source)	^2.1.0 -> ^2.1.1

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Release Notes

mdx-js/mdx

### [`v2.1.1`](https://togithub.com/mdx-js/mdx/releases/2.1.1) [Compare Source](https://togithub.com/mdx-js/mdx/compare/2.1.0...2.1.1) - [`e79fc2b`](https://togithub.com/mdx-js/mdx/commit/e79fc2be) [`0df684b`](https://togithub.com/mdx-js/mdx/commit/0df684bc) Fix to improve `_missingMdxReference` by [@​vlad-zhukov](https://togithub.com/vlad-zhukov) in [https://github.com/mdx-js/mdx/pull/1986](https://togithub.com/mdx-js/mdx/pull/1986), [https://github.com/mdx-js/mdx/pull/1988](https://togithub.com/mdx-js/mdx/pull/1988) **Full Changelog**: https://github.com/mdx-js/mdx/compare/2.1.0...2.1.1

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