deps: bump @next/mdx from 14.2.14 to 15.0.3

Bumps [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) from 14.2.14 to 15.0.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.0.3/packages/next-mdx)

---
updated-dependencies:
- dependency-name: "@next/mdx"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -24,7 +24,7 @@
     "@globus/sdk": "5.1.1",
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
-    "@next/mdx": "^14.2.14",
+    "@next/mdx": "^15.0.3",
     "@tanstack/react-query": "^5.60.2",
     "@tanstack/react-query-devtools": "^5.60.2",
     "@types/mdx": "^2.0.13",