🐞 Multiple Table of Contents widgets still create duplicate anchors (Duplicate of #11106)

In [this thread](https://github.com/elementor/elementor/issues/11106), @mareklexuan identified an issue where having multiple Table of Contents widgets on a single page would cause issues with anchors.

The way that Elementor creates anchors for the ToC widget means that it assigns the same incremental anchors in each widget, preventing the links from actually taking viewers where they need to go.

As you can see in the text below, @nicholaszein stated that the issue was resolved in Elementor Pro v3.15.0. I checked the changelogs and can't find anything about the ToC widget in v3.15.0. I also continue to have the issue on my website, all the way in Elementor Pro v3.21.0.

> Hello there!
>
> We have great news! 🙌
>
> ### 📢 We're happy to announce that the issue you raised was resolved in Elementor Pro v3.15.0! 🥳
>
> ✅ Feel free to check it out and update your plugin to the new version!
>
> _Check the changelog for more information:_
> [Changelog of Elementor and Elementor Pro](https://elementor.com/help/changelog-of-elementor/)
>
> Cheers 🥂

_Originally posted by @nicholaszein in https://github.com/elementor/elementor/issues/11106#issuecomment-1658847798_