Add U+2BD1 Uncertainty Sign

[TimurGerasimov250]

A very nice compliment, adding the missing symbol in the category of:
unknown or replacement related
�  ⯑
Its so simple, it could be easily added with similar code method to the U+FFFD �, but inverted colors to be black question mark on white shape, unlike. So it can be added to the font so soon and the issue can close so soon because its so simple. And add it to backlog to be added.
Body:

Hi! I'd like to request adding the Uncertainty Sign (U+2BD1 ⯑) to Iosevka. It's a simple but important symbol related to unknown/replacement characters, complementing U+FFFD (�). The design could follow a similar method as U+FFFD but inverted colors—a black question mark on a white shape.

Also I love how it looks like.
Image:

I really liked the way this symbol looks, so I felt I should share it, for whatever good it'll do. Attached is a work-in-progress image for reference.

This seems straightforward enough to add soon and then close the issue quickly. Please consider adding it to the backlog.

Thanks!

[TimurGerasimov250]

Close if it's already done