chore(deps): bump schemathesis from 4.6.6 to 4.6.8

Bumps [schemathesis](https://github.com/schemathesis/schemathesis) from 4.6.6 to 4.6.8.
- [Release notes](https://github.com/schemathesis/schemathesis/releases)
- [Changelog](https://github.com/schemathesis/schemathesis/blob/master/CHANGELOG.md)
- [Commits](schemathesis/schemathesis@v4.6.6...v4.6.8)

---
updated-dependencies:
- dependency-name: schemathesis
  dependency-version: 4.6.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]