`def f(o: "Alpha")` is the same annotation as `def f(o: Alpha)` — a
forward reference, and what every file under `from __future__ import
annotations` writes — but the receiver-type pattern stopped at the quote,
read no type, and `o.render()` produced no edge. Admit the quoted form.
Co-authored-by: Colby McHenry <colbymchenry@users.noreply.github.com>
