Bump pydantic from 1.7.3 to 1.7.4

Bumps [pydantic](https://github.com/samuelcolvin/pydantic) from 1.7.3 to 1.7.4.
- [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)

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

Author: dependabot[bot]