Update changelogs from fern repo (#5685)

Co-authored-by: jsklan <100491078+jsklan@users.noreply.github.com>

Author: fern-support

fern/products/sdks/generators/python/changelog/2026-06-03.mdx

@@ -1,3 +1,16 @@
+## 5.14.10
+**`(fix):`** Fix the typing of endpoints that extract a property from an optional response body. The
+`HttpResponse`/`AsyncHttpResponse` generic (and the corresponding client return type) is now
+wrapped in `Optional` when the underlying response body resolves to an optional type, so an
+empty response (`data=None`) no longer fails type checking.
+
+
+**`(fix):`** Fix the generated OAuth token provider to respect the auth scheme's `request-properties`
+mapping. The token endpoint is now invoked using the actual request parameter names
+(e.g. `username`/`password` or custom names) instead of always hard-coding
+`client_id`/`client_secret`.
+
+
 ## 5.14.9
 **`(fix):`** Fix generation failure in `output_directory: source-root` mode by skipping
 `poetry lock` and `ruff` commands that require a pyproject.toml which is not