Fix converter copying (#399)

* Fix converter copying

* History, pylint?

Author: Tinche

HISTORY.md

@@ -22,6 +22,8 @@
 - Improve handling of TypedDicts with forward references.
 - Speed up generated _attrs_ and TypedDict structuring functions by changing their signature slightly.
   ([#388](https://github.com/python-attrs/cattrs/pull/388))
+- Fix copying of converters using function hooks.
+  ([#398](https://github.com/python-attrs/cattrs/issues/398) [#399](https://github.com/python-attrs/cattrs/pull/399))
 
 ## 23.1.2 (2023-06-02)