Fix __complex__ type annotation

Co-authored-by: Bas van Beek <43369155+BvB93@users.noreply.github.com>

Original NumPy Commit: 91153af22ffc07d2b7653d406d93e99d136e89d6

Author: asmeurer

array_api_strict/_array_object.py

@@ -470,7 +470,7 @@ def __bool__(self: Array, /) -> bool:
         res = self._array.__bool__()
         return res
 
-    def __complex__(self: Array, /) -> float:
+    def __complex__(self: Array, /) -> complex:
         """
         Performs the operation __complex__.
         """