Update dependency pydantic to v1.7.3

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
pydantic	patch	==1.7.2 -> ==1.7.3

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Release Notes

samuelcolvin/pydantic

### [`v1.7.3`](https://togithub.com/samuelcolvin/pydantic/releases/v1.7.3) [Compare Source](https://togithub.com/samuelcolvin/pydantic/compare/v1.7.2...v1.7.3) See [Changelog](https://pydantic-docs.helpmanual.io/changelog/). Thank you to pydantic's sponsors: [@​timdrijvers](https://togithub.com/timdrijvers), [@​BCarley](https://togithub.com/BCarley), [@​chdsbd](https://togithub.com/chdsbd), [@​tiangolo](https://togithub.com/tiangolo), [@​matin](https://togithub.com/matin), [@​linusg](https://togithub.com/linusg), [@​kevinalh](https://togithub.com/kevinalh), [@​jorgecarleitao](https://togithub.com/jorgecarleitao), [@​koxudaxi](https://togithub.com/koxudaxi), [@​primer-api](https://togithub.com/primer-api), [@​mkeen](https://togithub.com/mkeen), [@​meadsteve](https://togithub.com/meadsteve) for their kind support. - fix: set right default value for required (optional) fields, [#​2142](https://togithub.com/samuelcolvin/pydantic/issues/2142) by [@​PrettyWood](https://togithub.com/PrettyWood) - fix: support `underscore_attrs_are_private` with generic models, [#​2138](https://togithub.com/samuelcolvin/pydantic/issues/2138) by [@​PrettyWood](https://togithub.com/PrettyWood) - fix: update all modified field values in `root_validator` when `validate_assignment` is on, [#​2116](https://togithub.com/samuelcolvin/pydantic/issues/2116) by [@​PrettyWood](https://togithub.com/PrettyWood) - Allow pickling of `pydantic.dataclasses.dataclass` dynamically created from a built-in `dataclasses.dataclass`, [#​2111](https://togithub.com/samuelcolvin/pydantic/issues/2111) by [@​aimestereo](https://togithub.com/aimestereo) - Fix a regression where Enum fields would not propagate keyword arguments to the schema, [#​2109](https://togithub.com/samuelcolvin/pydantic/issues/2109) by [@​bm424](https://togithub.com/bm424) - Ignore `__doc__` as private attribute when `Config.underscore_attrs_are_private` is set, [#​2090](https://togithub.com/samuelcolvin/pydantic/issues/2090) by [@​PrettyWood](https://togithub.com/PrettyWood)

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