[stubtest] ignore __conditional_annotations__

Author: jorenham

mypy/stubtest.py

@@ -1653,6 +1653,7 @@ def verify_typealias(
         "__loader__",
         "__spec__",
         "__annotations__",
+        "__conditional_annotations__",  # 3.14+
         "__annotate__",
         "__path__",  # mypy adds __path__ to packages, but C packages don't have it
         "__getattr__",  # resulting behaviour might be typed explicitly