[Bug]: Duplicate required properties in ObjectType/PropertiesList produce required array with duplicate entries

[edgarrmondragon]

Singer SDK Version

0.14.0

Python Version

NA

Bug scope

Configuration (settings parsing, validation, etc.)

Operating System

NA

Description

The following

ObjectType(
    Property("email", StringType, required=True),
    Property("email", StringType, required=True),
    Property("username", StringType, required=True),
)

results in the schema

{
  "type": "object",
  "properties": {
    "email": {
      "type": [
        "string"
      ]
    },
    "username": {
      "type": [
        "string"
      ]
    },
  },
  "required": [
    "email",
    "email",
    "username"
  ]
}

Code

No response