chore(types) Fix aafig mypy error

docs/_ext/aafig.py:88: error: Argument 1 to "update" of "MutableMapping" has incompatible type "dict[str, object]"; expected "SupportsKeysAndGetItem[str, Callable[[str], Any]]"  [arg-type]

Author: tony

docs/_ext/aafig.py

@@ -73,7 +73,7 @@ class AafigDirective(images.Image):
 
     has_content = True
     required_arguments = 0
-    own_option_spec: t.ClassVar = {
+    own_option_spec: t.ClassVar[dict[str, t.Callable[[str], t.Any]]] = {
         "line_width": float,
         "background": str,
         "foreground": str,