Typing for QueryInterface's bulkInsert & bulkUpdate attributes parameter is incorrect

[aryem]

Issue Creation Checklist

• I have read the contribution guidelines

Bug Description

SSCCE

// You can delete this code block if you have included a link to your SSCCE above!
const { createSequelizeInstance } = require('./dev/sscce-helpers');
const { Model, DataTypes } = require('.');
import { QueryInterface } from 'sequelize';

const sequelize = createSequelizeInstance({ benchmark: true });

class User extends Model {}
User.init({
  username: DataTypes.STRING,
  birthday: DataTypes.DATE
}, { sequelize, modelName: 'user' });

(async () => {
  await sequelize.sync({ force: true });

   const queryInterface: QueryInterface = sequelize.getQueryInterface();

   // Gives typying error because attributes type is string[] | string, but that is not correct.  
  await queryInterface.bulkUpdate("user", {}, {}, {}, attributes);
 await queryInterface.bulkInsert("user", {}, {}, {}, attributes);
  
  await sequelize.close();
})();

What do you expect to happen?

The type of attributes parameter is incorrect for bulkInsert & bulkUpdate.

• Currently, the type of attributes is string[] | string | undefined but it should be of type object.
• Query interface API docs

Environment

• Sequelize version: v6.6.5
• Node.js version: 14.16.1
• If TypeScript related: TypeScript version: 3.9.6

Bug Report Checklist

How does this problem relate to dialects?

• I think this problem happens regardless of the dialect.
• I think this problem happens only for the following dialect(s):
• I don't know, I was using PUT-YOUR-DIALECT-HERE, with connector library version XXX and database version XXX

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• Yes, I have the time but I don't know how to start, I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.