Missing OpenAPI v3.1 schema

[AaronNGray]

The OpenAPi v3.1 spec is missing and there are broken links :-

https://github.com/OAI/OpenAPI-Specification/blob/master/schemas/v3.1/schema.json

https://github.com/OAI/OpenAPI-Specification/blob/main/schemas/v3.0/schema.json

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