Update changelogs from fern repo (#2535)

Co-authored-by: tjb9dc <22457193+tjb9dc@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/python/changelog/2025-11-28.mdx

@@ -1,3 +1,9 @@
+## 4.42.0
+**`(feat):`** Add async support for OAuth token provider. The generated SDK now includes an AsyncOAuthTokenProvider
+class that uses asyncio.Lock for async-safe token refresh, alongside the existing sync OAuthTokenProvider
+that uses threading.Lock. The async client now uses the async token provider for proper async token management.
+
+
 ## 4.41.3
 **`(fix):`** Fix multipart form data requests to omit None values instead of converting them to empty strings.
 This prevents httpx from sending empty strings for optional parameters that should be absent.