Bug Report

Describe the bug
The message model in 'replyMessage' seems not compatible with the type exported with the @line/bot-sdk

To Reproduce

Steps to reproduce the behavior:

1. example

import type { FlexMessage } from "@line/bot/sdk"
await this.client.replyMessage({
      replyToken: event.replyToken,
      messages: [
        {
          type: "text",
          text: response
        },
        createEndSessionFlexMessage() as FlexMessage
      ]
    });

error

Type 'FlexMessage' is not assignable to type '{ type: "flex"; altText: string; contents: FlexContainer; }'.
      Types of property 'contents' are incompatible.

Expected behavior
It should be no type error between two kinds of 'FlexMessage' from model/flexMessage.ts and types.ts

Environment (please complete the following information):

• OS: [e.g. macOS]
• Node.js Version [e.g. Node 20]
• line-bot-sdk-nodejs version(s) [e.g. 9.5.0]