Update changelogs from fern repo (#5643)

Co-authored-by: dsinghvi <10870189+dsinghvi@users.noreply.github.com>

Author: fern-support

fern/products/sdks/generators/python/changelog/2026-05-28.mdx

@@ -1,3 +1,11 @@
+## 5.14.6
+**`(fix):`** Improve SSE event parsing and deserialization performance by caching resolved type hints
+and short-circuiting `convert_and_respect_annotation_metadata` when a type has no aliased
+fields. Previously every call recomputed `typing.get_type_hints` and walked the entire type
+graph, which was very expensive for streams parsing many events against large discriminated
+unions. Output is unchanged.
+
+
 ## 5.14.5
 **`(fix):`** Fix TypedDict alias generation when `use_typeddict_requests: true` so that
 container element types (`List[T]`, `Dict[K, V]`, `Set[T]`) and direct aliases