[Bug]: Multiselect typings are incorrect for onchange event

[a88zach]

Package

@carbon/react

Browser

No response

Package version

1.57.0

React version

18.3.1

Description

The typings are incorrect for the Multiselect onchange event.

Reproduction/example

https://stackblitz.com/edit/github-1ithgj?file=src%2FApp.tsx

Steps to reproduce

Load the stackblitz and inspect the compiler error

Suggested Severity

Severity 3 = User can complete task, and/or has a workaround within the user experience of a given component.

Application/PAL

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I checked the current issues for duplicate problems

[a88zach]

Caused by #16147

cc: @guidari

[ggdawson]

Could be as simple as a local OnChangeData. WIP PR here -> #16440

Not yet clear if that type needs to be exported for broader use.