This PR relaxes the workspace `core-foundation` pin from an exact
`=0.10.0` to `0.10`.

I am not sure why this is pinned - digging a bit did not turn up any
specific reason so I have to assume it was not on purpose. At the moment
you cannot use gpui with nusb 0.2 (which is muuuuuch improved over 0.1,
it's not a cosmetic update) for example because of this restriction.

I would much appreciate if this relaxation was in the realm of
possibilities :)

Release Notes:

- N/A