Update changelogs from fern repo (#5635)

Author: fern-support

fern/products/sdks/generators/python/changelog/2026-03-27.mdx

@@ -23,15 +23,3 @@ sync token callables to block the event loop in async contexts.
 different environments (production/sandbox) when initializing the client.
 
 
-## 5.0.9
-**`(fix):`** Fix SSE union discrimination for both data-level and protocol-level contexts.
-
-Data-level: Simplify `parse_sse_obj` to always parse the SSE `data` field as
-JSON instead of using runtime heuristics. This fixes incorrect routing when the
-discriminant field name (e.g., `event`) collides with an SSE envelope field.
-
-Protocol-level: Generate an if/elif dispatch chain at code-generation time that
-routes on `_sse.event`, parsing each variant's data payload into its concrete
-type. No runtime "if casing" — the generator decides the code path statically.
-
-