Update mdx monorepo to ^1.6.21- autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@mdx-js/mdx (source)	dependencies	patch	^1.6.18 -> ^1.6.21
@mdx-js/react (source)	dependencies	patch	^1.6.18 -> ^1.6.21

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Release Notes

mdx-js/mdx

### [`v1.6.21`](https://togithub.com/mdx-js/mdx/compare/v1.6.20...v1.6.21) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.20...v1.6.21) ### [`v1.6.20`](https://togithub.com/mdx-js/mdx/compare/v1.6.19...v1.6.20) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.19...v1.6.20) ### [`v1.6.19`](https://togithub.com/mdx-js/mdx/compare/v1.6.18...v1.6.19) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.18...v1.6.19)

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