fix(deps): update mdx monorepo to v1.6.22

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@mdx-js/mdx (source)	1.6.5 -> 1.6.22
@mdx-js/react (source)	1.6.5 -> 1.6.22
babel-plugin-remove-export-keywords	1.6.18 -> 1.6.22

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Release Notes

mdx-js/mdx (@​mdx-js/mdx)

v1.6.22

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• Bump dependencies
• Update documentation

v1.6.21

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v1.6.20

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v1.6.19

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v1.6.18

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v1.6.17

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v1.6.16

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• Only add makeShortcode function if it's needed (https://github.com/mdx-js/mdx/pull/1088)

v1.6.15

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• Bump dependencies

v1.6.14

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v1.6.13

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• Pin internal dependencies of the monorepo

v1.6.12

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v1.6.11

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• Handle case when file in toJSX plugin is undefined (#​1156)

v1.6.10

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• Gracefully handle falsy values of options.file passed to toJSX compiler (#​1155)

v1.6.9

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• Fix handling of virtual files in case they're null (#​1153)

v1.6.8

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• Pass file to babel for improved error messaging (#​1126)
• Docs updates
• Bump deps

v1.6.7

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• Improve shortcode error messages (#​1136)

v1.6.6

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• Bump upstream dependencies

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