chore(deps): bump multer in /examples/6-multi-file-spec

Bumps [multer](https://github.com/expressjs/multer) from 2.0.1 to 2.0.2.
- [Release notes](https://github.com/expressjs/multer/releases)
- [Changelog](https://github.com/expressjs/multer/blob/main/CHANGELOG.md)
- [Commits](expressjs/multer@v2.0.1...v2.0.2)

---
updated-dependencies:
- dependency-name: multer
  dependency-version: 2.0.2
  dependency-type: indirect
...

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Author: dependabot[bot]