Update dependency gatsby-plugin-mdx to v2.14.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby-plugin-mdx	2.14.1 -> 2.14.2

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Release Notes

gatsbyjs/gatsby

### [`v2.14.2`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-mdx@2.14.1...gatsby-plugin-mdx@2.14.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby-plugin-mdx@2.14.1...gatsby-plugin-mdx@2.14.2)

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Configuration

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• [ ] If you want to rebase/retry this PR, click this checkbox.

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