Bump dot-prop from 4.2.0 to 4.2.1 in /20. File Upload and Download

Bumps [dot-prop](https://github.com/sindresorhus/dot-prop) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/sindresorhus/dot-prop/releases)
- [Commits](sindresorhus/dot-prop@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: dot-prop
  dependency-type: indirect
...

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Author: dependabot[bot]