Issue with specs with circular references

[gcpagano]

Specs with circular references that used to be parsed and generated correctly using version 1.11.0 fail parsing when using version 1.12.x with error kin-openapi bug found: circular schema reference not handled

I think the issue is related to https://github.com/getkin/kin-openapi/issues/615 It seems kin-openapi has made CircularReferenceCounter configurable to work around the problem. It would be great if oapi-codegen could expose CircularReferenceCounter as a configuration setting