build(deps): bump gatsby-plugin-mdx from 1.2.43 to 1.7.1 in /docs

Bumps [gatsby-plugin-mdx](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-mdx) from 1.2.43 to 1.7.1.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/[email protected]/packages/gatsby-plugin-mdx/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/[email protected]/packages/gatsby-plugin-mdx)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/package-lock.json

@@ -18,7 +18,7 @@
     "gatsby-plugin-emotion": "^4.3.10",
     "gatsby-plugin-google-analytics": "^2.8.0",
     "gatsby-plugin-manifest": "^2.4.27",
-    "gatsby-plugin-mdx": "^1.2.43",
+    "gatsby-plugin-mdx": "^1.7.1",
     "gatsby-plugin-netlify": "^2.3.13",
     "gatsby-plugin-netlify-cache": "^1.2.0",
     "gatsby-plugin-offline": "^3.2.27",
@@ -36,7 +36,7 @@
     "gatsby-remark-responsive-iframe": "^2.8.0",
     "gatsby-source-filesystem": "^2.3.30",
     "gatsby-transformer-remark": "^2.8.28",
-    "gatsby-transformer-sharp": "^2.5.15",
+    "gatsby-transformer-sharp": "^2.9.0",
     "gatsby-transformer-yaml": "^2.4.11",
     "polished": "^4.0.3",
     "prism-react-renderer": "^1.1.1",