[BUG] [Kotlin Client] use uniqueItems rather than isUniqueItems

Description

The template modules/openapi-generator/src/main/resources/kotlin-client/data_class_req_var.mustache incorrectly uses tag isUniqueItems rather than uniqueItems. This causes Set types to be generated as List types.

openapi-generator version

6.2.1 (latest)

OpenAPI declaration file content or url

        roleIds:
          maxItems: 2147483647
          minItems: 1
          uniqueItems: true
          type: array
          default: [ ]
          nullable: true
          items:
            type: string

Should generate:

    @field:JsonProperty("roleIds", required = true) val roleIds: kotlin.collections.Set<java.util.UUID> = setOf(),

But instead generates:

    @field:JsonProperty("roleIds", required = true) val roleIds: kotlin.collections.List<java.util.UUID> = setOf(),

Which does not compile.

Suggest a fix

Change last line line (25) of template modules/openapi-generator/src/main/resources/kotlin-client/data_class_req_var.mustache

FROM:

{{#multiplatform}}@SerialName(value = "{{{vendorExtensions.x-base-name-literal}}}") @Required {{/multiplatform}}{{#isInherited}}override {{/isInherited}}{{>modelMutable}} {{{name}}}: {{#isArray}}{{#isList}}{{#isUniqueItems}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}Set{{/isUniqueItems}}{{^isUniqueItems}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}List{{/isUniqueItems}}{{/isList}}{{^isList}}kotlin.Array{{/isList}}<{{^items.isEnum}}{{^items.isPrimitiveType}}{{^items.isModel}}{{#kotlinx_serialization}}@Contextual {{/kotlinx_serialization}}{{/items.isModel}}{{/items.isPrimitiveType}}{{{items.dataType}}}{{/items.isEnum}}{{#items.isEnum}}{{classname}}.{{{nameInCamelCase}}}{{/items.isEnum}}>{{/isArray}}{{^isEnum}}{{^isArray}}{{{dataType}}}{{/isArray}}{{/isEnum}}{{#isEnum}}{{^isArray}}{{classname}}.{{{nameInCamelCase}}}{{/isArray}}{{/isEnum}}{{#isNullable}}?{{/isNullable}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{^multiplatform}}{{{dataType}}}("{{{defaultValue}}}"){{/multiplatform}}{{#multiplatform}}({{{defaultValue}}}).toDouble(){{/multiplatform}}{{/isNumber}}{{/defaultValue}}

TO:

{{#multiplatform}}@SerialName(value = "{{{vendorExtensions.x-base-name-literal}}}") @Required {{/multiplatform}}{{#isInherited}}override {{/isInherited}}{{>modelMutable}} {{{name}}}: {{#isArray}}{{#isList}}{{#uniqueItems}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}Set{{/uniqueItems}}{{^uniqueItems}}kotlin.collections.{{#modelMutable}}Mutable{{/modelMutable}}List{{/uniqueItems}}{{/isList}}{{^isList}}kotlin.Array{{/isList}}<{{^items.isEnum}}{{^items.isPrimitiveType}}{{^items.isModel}}{{#kotlinx_serialization}}@Contextual {{/kotlinx_serialization}}{{/items.isModel}}{{/items.isPrimitiveType}}{{{items.dataType}}}{{/items.isEnum}}{{#items.isEnum}}{{classname}}.{{{nameInCamelCase}}}{{/items.isEnum}}>{{/isArray}}{{^isEnum}}{{^isArray}}{{{dataType}}}{{/isArray}}{{/isEnum}}{{#isEnum}}{{^isArray}}{{classname}}.{{{nameInCamelCase}}}{{/isArray}}{{/isEnum}}{{#isNullable}}?{{/isNullable}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{^multiplatform}}{{{dataType}}}("{{{defaultValue}}}"){{/multiplatform}}{{#multiplatform}}({{{defaultValue}}}).toDouble(){{/multiplatform}}{{/isNumber}}{{/defaultValue}}