Update openapi-spec-validator requirement from ^0.5.6 to ^0.6.0 (#109)

Updates the requirements on [openapi-spec-validator](https://github.com/python-openapi/openapi-spec-validator) to permit the latest version.
- [Release notes](https://github.com/python-openapi/openapi-spec-validator/releases)
- [Commits](https://github.com/python-openapi/openapi-spec-validator/compare/0.5.6...0.6.0)

---
updated-dependencies:
- dependency-name: openapi-spec-validator
  dependency-type: direct:development
...

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

pyproject.toml

@@ -24,7 +24,7 @@ isort = "^5.12.0"
 jsonpatch = "^1.32"
 mypy = "^1.2.0"
 openapi-parser = "^0.2.6"
-openapi-spec-validator = "^0.5.6"
+openapi-spec-validator = "^0.6.0"
 prance = "^23.6.21"
 pyenchant = "^3.2.2"
 pytest = "^7.0.1"