build(deps-dev): bump schemathesis from 4.0.21 to 4.0.25 in /clients/python (kubeflow#1450)

Bumps [schemathesis](https://github.com/schemathesis/schemathesis) from 4.0.21 to 4.0.25.
- [Release notes](https://github.com/schemathesis/schemathesis/releases)
- [Changelog](https://github.com/schemathesis/schemathesis/blob/master/CHANGELOG.md)
- [Commits](schemathesis/schemathesis@v4.0.21...v4.0.25)

---
updated-dependencies:
- dependency-name: schemathesis
  dependency-version: 4.0.25
  dependency-type: direct:development
  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>

Author: dependabot[bot]