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02809490 - [ty] fix panic when attempting to infer the variance of a PEP-695 class that depends on a recursive type aliases and also somehow protocols (#21778)

[ty] fix panic when attempting to infer the variance of a PEP-695 class that depends on a recursive type aliases and also somehow protocols (#21778) Fixes https://github.com/astral-sh/ty/issues/1716. ## Test plan I added a corpus snippet that causes us to panic on `main` (I tested by running `cargo run -p ty_python_semantic --test=corpus` without the fix applied).