[Security] Bump dot-prop from 4.2.0 to 4.2.1

Bumps [dot-prop](https://github.com/sindresorhus/dot-prop) from 4.2.0 to 4.2.1. **This update includes a security fix.**
- [Release notes](https://github.com/sindresorhus/dot-prop/releases)
- [Commits](https://github.com/sindresorhus/dot-prop/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>