Rule `no-ref-siblings` is incorrectly being applied on versions 3.1 & 3.2

[luke-hagar-sp]

https://quobix.com/vacuum/rules/schemas/no-ref-siblings/

https://spec.openapis.org/oas/v3.2.0.html#reference-object
https://spec.openapis.org/oas/v3.1.2.html#reference-object

[daveshanley]

What version of vacuum? I cannot reproduce this. It was fixed in v0.20.1

• no-$ref-siblings only fires on Swagger 2.0 and OpenAPI 3.0.x
• oas3-no-$ref-siblings fires on 3.1 but always returns empty results (libopenapi rebuilds the model)
• For 3.2, neither rule fires, which is correct behavior