remove: remove utils/deep-set

This commit removes `@stdlib/utils/deep-set` in favor of
`@stdlib/object/deep-set`.

BREAKING CHANGE: remove `utils/deep-set`

To migrate, users should update their require/import paths to use
`@stdlib/object/deep-set` which provides the same API and implementation.

Ref: #8755

Author: Neerajpathak07