chore: bump form-data in /test-files/webpack-project (#427)

Bumps  and [form-data](https://github.com/form-data/form-data). These dependencies needed to be updated together.

Updates `form-data` from 4.0.5 to 4.0.6
- [Changelog](https://github.com/form-data/form-data/blob/master/CHANGELOG.md)
- [Commits](form-data/form-data@v4.0.5...v4.0.6)

Updates `form-data` from 2.5.5 to 2.5.6
- [Changelog](https://github.com/form-data/form-data/blob/master/CHANGELOG.md)
- [Commits](form-data/form-data@v4.0.5...v4.0.6)

---
updated-dependencies:
- dependency-name: form-data
  dependency-version: 4.0.6
  dependency-type: indirect
- dependency-name: form-data
  dependency-version: 2.5.6
  dependency-type: indirect
...

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Author: dependabot[bot]