Update to support OpenAPI 3.1.x

[riussi]

[AX-LLaidley]

I second this. Tried to use this extension just now and found that it doesn't support OpenAPI 3.1.0

[sdykae]

update please

[mickeyperlstein]

me three

[Glitchy-Sheep]

Up 🚀

Really good extension to work with, but lack of 3.1.0 support.

[johnfolkesson]

+1 for 3.1.0 support