chore(deps): bump openapi-spec-validator from 0.2.8 to 0.5.7

Bumps [openapi-spec-validator](https://github.com/python-openapi/openapi-spec-validator) from 0.2.8 to 0.5.7.
- [Release notes](https://github.com/python-openapi/openapi-spec-validator/releases)
- [Commits](python-openapi/openapi-spec-validator@0.2.8...0.5.7)

---
updated-dependencies:
- dependency-name: openapi-spec-validator
  dependency-version: 0.5.7
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]