Bump the example-dependencies group across 1 directory with 2 updates

Bumps the example-dependencies group with 2 updates in the /example directory: [@next/eslint-plugin-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-plugin-next) and [next](https://github.com/vercel/next.js).


Updates `@next/eslint-plugin-next` from 15.1.6 to 15.2.1
- [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/v15.2.1/packages/eslint-plugin-next)

Updates `next` from 15.1.6 to 15.2.1
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.1.6...v15.2.1)

---
updated-dependencies:
- dependency-name: "@next/eslint-plugin-next"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: example-dependencies
- dependency-name: next
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: example-dependencies
...

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

Author: dependabot[bot]

example/package-lock.json

@@ -24,9 +24,9 @@
   },
   "devDependencies": {
     "@babel/plugin-syntax-object-rest-spread": "^7.8.3",
-    "@next/eslint-plugin-next": "^15.1.6",
+    "@next/eslint-plugin-next": "^15.2.1",
     "@types/react": "^18.2.41",
-    "next": "^15.1.6",
+    "next": "^15.2.1",
     "rimraf": "^5.0.5"
   },
   "browserslist": [