fix: handle " in string enum values

[mnahkies]

should probably expand this to handle other things like \n but I've not seen newlines appear in string enum values very often...

allows supporting stuff like this https://github.com/APIs-guru/openapi-directory/blob/dec74da7a6785d5d5b83bc6a4cebc07336d67ec9/APIs/vercel.com/0.0.1/openapi.yaml#L4810

though I'd bet money that this is a mistake, and was supposed to be import(..) and resolve to more sensible values like production / preview / development in the yaml

target:
  description: The target environment of the environment variable
  examples:
    - - production
      - preview
  items:
    enum:
      - mport("/vercel/path0/utils/env-variable-util/types").EnvTarget.Productio
      - mport("/vercel/path0/utils/env-variable-util/types").EnvTarget.Previe
      - mport("/vercel/path0/utils/env-variable-util/types").EnvTarget.Developmen
  type: array