UpdateOptions is missing plain property

[seanh169]

Issue Creation Checklist

• [ x] I understand that my issue will be automatically closed if I don't fill in the requested information
• [ x] I have read the contribution guidelines

Bug Description

Attempting to update an entity, the UpdateOptions type does not include the plain option.

Reproducible Example

const updatedUser = await User.update( { name: 'Joe' }, { where: { id: 1 }, returning: true, plain: true } )

Here is the link to the SSCCE for this issue:

What do you expect to happen?

I expect to see plain on the type of UpdateOptions found here ->
(https://github.com/sequelize/sequelize/blob/main/packages/core/src/model.d.ts#L1244)

What is actually happening?

I am receiving this TS error ->

Environment

• Sequelize version: 6.35.2
• Node.js version: 16.13.0
• If TypeScript related: TypeScript version: 5.3.3
• Database & Version: MSSQL
• Connector library & Version: tedious

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

• Yes, I have the time and I know how to start.
• [x ] Yes, I have the time but I will need guidance.
• No, I don't have the time, but my company or I are supporting Sequelize through donations on OpenCollective.
• No, I don't have the time, and I understand that I will need to wait until someone from the community or maintainers is interested in resolving my issue.

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[ephys]

What is the goal of using the plain option here?