build(deps-dev): bump @mdx-js/loader from 2.0.0-next.9 to 2.1.2

Bumps [@mdx-js/loader](https://github.com/mdx-js/mdx/tree/HEAD/packages/loader) from 2.0.0-next.9 to 2.1.2.
- [Release notes](https://github.com/mdx-js/mdx/releases)
- [Changelog](https://github.com/mdx-js/mdx/blob/main/changelog.md)
- [Commits](https://github.com/mdx-js/mdx/commits/2.1.2/packages/loader)

---
updated-dependencies:
- dependency-name: "@mdx-js/loader"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -78,7 +78,7 @@
     "@babel/plugin-proposal-class-properties": "^7.17.12",
     "@babel/preset-env": "^7.18.6",
     "@babel/preset-react": "^7.18.6",
-    "@mdx-js/loader": "^2.0.0-next.9",
+    "@mdx-js/loader": "^2.1.2",
     "@octokit/auth-action": "^2.0.0",
     "@octokit/rest": "^19.0.3",
     "@parcel/css": "^1.11.2",