[Security] Bump pydantic from 1.7.3 to 1.7.4 (#84)

Bumps [pydantic](https://github.com/samuelcolvin/pydantic) from 1.7.3 to 1.7.4. **This update includes a security fix.**
- [Release notes](https://github.com/samuelcolvin/pydantic/releases)
- [Changelog](https://github.com/samuelcolvin/pydantic/blob/master/HISTORY.md)
- [Commits](pydantic/pydantic@v1.7.3...v1.7.4)

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