[BUG] [Swift6] Map type with $ref'd additionalProperties resolves to [String: Dictionary]

[winrid]

A nested map property whose additionalProperties is a $ref to an aliased map schema produces [String: Dictionary] (no generic args, doesn't compile in Swift 6) instead of the resolved type.

StringMap:
  type: object
  additionalProperties: { type: string }
EmailTemplate:
  properties:
    translationOverridesByLocale:
      type: object
      additionalProperties:
        $ref: '#/components/schemas/StringMap'

Expected [String: [String: String]]. Working on a PR.