Update dependency pydantic to v2.6.4

This MR contains the following updates:

Package	Type	Update	Change
pydantic (changelog)	dependencies	patch	2.6.3 -> 2.6.4

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Release Notes

pydantic/pydantic (pydantic)

v2.6.4

Compare Source

GitHub release

What's Changed

Fixes

• Fix usage of AliasGenerator with computed_field decorator by @​sydney-runkle in #​8806
• Fix nested discriminated union schema gen, pt 2 by @​sydney-runkle in #​8932
• Fix bug with no_strict_optional=True caused by API deferral by @​dmontagu in #​8826

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