Bump pydantic from 1.8.2 to 1.9.0 (#442)

Bumps [pydantic](https://github.com/samuelcolvin/pydantic) from 1.8.2 to 1.9.0.
- [Release notes](https://github.com/samuelcolvin/pydantic/releases)
- [Changelog](https://github.com/samuelcolvin/pydantic/blob/master/HISTORY.md)
- [Commits](pydantic/pydantic@v1.8.2...v1.9.0)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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