chore(deps): update minor and patch for gatsby-remark-responsive-iframe

[wardpeet]

This PR contains the following updates:

Package	Type	Update	Change
remark-mdx (source)	devDependencies	patch	^1.6.6 -> ^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) ### [`v1.6.16`](https://togithub.com/mdx-js/mdx/releases/v1.6.16) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.15...v1.6.16) - Only add `makeShortcode` function if it's needed ([#​1088](https://togithub.com/mdx-js/mdx/pull/1088)) ### [`v1.6.15`](https://togithub.com/mdx-js/mdx/releases/v1.6.15) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.14...v1.6.15) - Bump dependencies ### [`v1.6.14`](https://togithub.com/mdx-js/mdx/compare/v1.6.13...v1.6.14) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.13...v1.6.14) ### [`v1.6.13`](https://togithub.com/mdx-js/mdx/releases/v1.6.13) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.12...v1.6.13) - Pin internal dependencies of the monorepo ### [`v1.6.12`](https://togithub.com/mdx-js/mdx/compare/v1.6.11...v1.6.12) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.11...v1.6.12) ### [`v1.6.11`](https://togithub.com/mdx-js/mdx/releases/v1.6.11) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.10...v1.6.11) - Handle case when file in `toJSX` plugin is `undefined` ([#​1156](https://togithub.com/mdx-js/mdx/issues/1156)) ### [`v1.6.10`](https://togithub.com/mdx-js/mdx/releases/v1.6.10) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.9...v1.6.10) - Gracefully handle falsy values of `options.file` passed to `toJSX` compiler ([#​1155](https://togithub.com/mdx-js/mdx/issues/1155)) ### [`v1.6.9`](https://togithub.com/mdx-js/mdx/releases/v1.6.9) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.8...v1.6.9) - Fix handling of virtual files in case they're null ([#​1153](https://togithub.com/mdx-js/mdx/issues/1153)) ### [`v1.6.8`](https://togithub.com/mdx-js/mdx/releases/v1.6.8) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.7...v1.6.8) - Pass file to babel for improved error messaging ([#​1126](https://togithub.com/mdx-js/mdx/issues/1126)) - Docs updates - Bump deps ### [`v1.6.7`](https://togithub.com/mdx-js/mdx/releases/1.6.7) [Compare Source](https://togithub.com/mdx-js/mdx/compare/v1.6.6...v1.6.7) - Improve shortcode error messages ([#​1136](https://togithub.com/mdx-js/mdx/issues/1136))

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