check_callable: add unnecessary type ignore comment for pyright

Author: randolf-scholz

stdlib/@tests/test_cases/builtins/check_callable.py

@@ -4,5 +4,5 @@
 def check_gradual_guarantee(arg: Any) -> int:
     # if Any materialized to `Callable[[], int] | None`, this function type checks
     if callable(arg):
-        return arg()  # type: ignore[no-any-return]
+        return arg()  # type: ignore[no-any-return]  # pyright: ignore[reportUnnecessaryTypeIgnoreComment]
     return -1