chore(deps): bump dot-prop from 4.1.1 to 4.2.1 in /legacy

Bumps [dot-prop](https://github.com/sindresorhus/dot-prop) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/sindresorhus/dot-prop/releases)
- [Commits](sindresorhus/dot-prop@v4.1.1...v4.2.1)

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

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