Bump @mdx-js/esbuild from 2.1.4 to 2.1.5 in /docs

Bumps [@mdx-js/esbuild](https://github.com/mdx-js/mdx/tree/HEAD/packages/esbuild) from 2.1.4 to 2.1.5.
- [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/2.1.5/packages/esbuild)

---
updated-dependencies:
- dependency-name: "@mdx-js/esbuild"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -16,7 +16,7 @@
     "test": "exit 1"
   },
   "dependencies": {
-    "@mdx-js/esbuild": "^2.1.4",
+    "@mdx-js/esbuild": "^2.1.5",
     "@mdx-js/mdx": "^2.1.4",
     "@mdx-js/react": "^2.1.4"
   }