Update TS definition to fix #10498

[angrycat9000]

Description

Fixes Typescript definition for Event.raiseEvent to have the correct typing.

Issue number and link

#10498

Testing plan

Create a typescript file with the following code

import {Event} from "@cesium/engine";
const event = new Event<(value:number)=>void>();
event.raiseEvent(3);

Verify that on main, that the last line displays an error.

Check out this branch and run npm run build-ts

Verify that no error is displayed now.

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• [NA] I have added or updated unit tests to ensure consistent code coverage
• [NA] I have update the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @angrycat9000!

✅ We can confirm we have a CLA on file for you.

[ggetz]

Thanks @angrycat9000. This looks good to me.