Bump pydantic from 2.6.3 to 2.6.4 in /docker/auth-utils (#25037)

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v2.6.3...v2.6.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>