chore(deps): update mdx monorepo to v1.6.18

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@mdx-js/mdx (source)	dependencies	patch	1.6.16 -> 1.6.18
@mdx-js/react (source)	dependencies	patch	1.6.16 -> 1.6.18

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Release Notes

mdx-js/mdx

### [`v1.6.18`](https://togithub.com/mdx-js/mdx/compare/v1.6.17...v1.6.18) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.17...v1.6.18) ### [`v1.6.17`](https://togithub.com/mdx-js/mdx/compare/v1.6.16...v1.6.17) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.16...v1.6.17)

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[github-actions[bot]]

:tada: This PR is included in version 2.0.0-next.9 :tada:

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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