chore(deps): bump the next group with 3 updates (#3618)

Bumps the next group with 3 updates: [next](https://github.com/vercel/next.js), [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) and [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next).


Updates `next` from 15.1.1 to 15.1.2
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.1.1...v15.1.2)

Updates `@next/mdx` from 15.1.1 to 15.1.2
- [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/v15.1.2/packages/next-mdx)

Updates `eslint-config-next` from 15.1.1 to 15.1.2
- [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/v15.1.2/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: next
- dependency-name: "@next/mdx"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: next
- dependency-name: eslint-config-next
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: next
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

showcases/patternhub/package.json

@@ -26,7 +26,7 @@
     "@db-ux/core-icons": "0.0.7",
     "dompurify": "3.2.3",
     "highlight.js": "^11.11.0",
-    "next": "15.1.1",
+    "next": "15.1.2",
     "react": "18.3.1",
     "react-archer": "^4.4.0",
     "react-dom": "18.3.1",
@@ -36,14 +36,14 @@
   "devDependencies": {
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
-    "@next/mdx": "^15.1.1",
+    "@next/mdx": "^15.1.2",
     "@types/dompurify": "3.2.0",
     "@types/node": "22.10.2",
     "@types/react": "18.3.13",
     "@types/react-dom": "18.3.1",
     "esbuild": "0.24.0",
     "eslint": "8.57.0",
-    "eslint-config-next": "15.1.1",
+    "eslint-config-next": "15.1.2",
     "iframe-resizer": "^5.3.2",
     "open-cli": "^8.0.0",
     "sass": "1.77.4",