Update changelogs from fern repo (#815)

Co-authored-by: dsinghvi <[email protected]>

Author: fern-support

fern/products/sdks/overview/typescript/changelog/2025-09-08.mdx

@@ -1,3 +1,8 @@
+## 2.11.1
+**`(fix):`** The `_getAuthorizationHeader` method now returns `Promise<string | undefined>` when oauth is enabled. 
+This prevents compilation errors in the TypeScript SDK.
+
+
 ## 2.11.0
 **`(feat):`** Generate `Request` and `Response` types variations for types that have readonly and/or writeonly properties.
 For example, a type `User` will have a `User.Request` type that omits readonly properties and a `User.Response` type that omits writeonly properties.