Update openapi-spec-validator requirement from <0.7.0,>=0.6.0 to >=0.6.0,<0.8.0 (#412)

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](python-openapi/openapi-spec-validator@0.6.0...0.7.0)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -73,7 +73,7 @@ test = [
   "ipykernel",
   "pytest-jupyter[server]>=0.6.2",
   "openapi_core~=0.18.0",
-  "openapi-spec-validator>=0.6.0,<0.7.0",
+  "openapi-spec-validator>=0.6.0,<0.8.0",
   "sphinxcontrib_spelling",
   "requests_mock",
   "ruamel.yaml",