[openapi-schema-validator] Add support for OAS v3.1.0 schema

[Rafael Oliveira]

Support validating v3.1.0, not just v3.0.0.

It's probably just a matter of adding this: https://github.com/OAI/OpenAPI-Specification/blob/main/schemas/v3.1/schema-base.json (not sure)

[Yair levi]

+1

[Yahor Siarheyenka]

+1

[Marat A. Denenberg]

+1

[Yahor Siarheyenka]

Pls, somebody make it happen 🙏

[Elliott Miller]

This would be a life saver!

[Joe Spencer]

PRs are welcome