ruff

ac6219ec - [red-knot] fix collapsing literal and its negation to object (#17605)

[red-knot] fix collapsing literal and its negation to object (#17605) ## Summary Another follow-up to the unions-of-large-literals optimization. Restore the behavior that e.g. `Literal[""] | ~Literal[""]` collapses to `object`. ## Test Plan Added mdtests.