Bump multer from 1.4.1 to 2.2.0 in /packages/web-component-tester

Bumps [multer](https://github.com/expressjs/multer) from 1.4.1 to 2.2.0.
- [Release notes](https://github.com/expressjs/multer/releases)
- [Changelog](https://github.com/expressjs/multer/blob/main/CHANGELOG.md)
- [Commits](expressjs/multer@v1.4.1...v2.2.0)

---
updated-dependencies:
- dependency-name: multer
  dependency-version: 2.2.0
  dependency-type: direct:production
...

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Author: dependabot[bot]