fix: 【textarea】maxLength属性支持string

Author: cuiaiguanggh

devui/textarea/src/textarea-types.ts

@@ -22,7 +22,7 @@ export const textareaProps = {
  default: '',
  },
  maxLength: {
- type: Number,
+ type: [String, Number] as PropType<number | string>,
  default: undefined,
  },
  disabled: {