add missing call_annotate_func to stub file

src/ducktools/classbuilder/annotations.pyi

@@ -1,3 +1,4 @@
+from collections.abc import Callable
 import typing
 import types
 
@@ -8,6 +9,11 @@ class _StringGlobs(dict):
     def __missing__(self, key: _T) -> _T: ...
 
 
+def call_annotate_func(
+        annotate: Callable[[int], dict[str, type | typing.ForwardRef]]
+) -> dict[str, type | str]: ...
+
+
 def eval_hint(
     hint: type | str,
     context: None | dict[str, typing.Any] = None,