Update changelogs from fern repo (#5444)

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

Author: fern-support

fern/products/sdks/generators/typescript/changelog/2026-05-08.mdx

@@ -1,3 +1,11 @@
+## 3.70.3
+**`(fix):`** Honor the auth scheme `prefix` for `HeaderAuthScheme` when generating `HeaderAuthProvider`.
+Previously, the generator emitted the raw header value into the configured header (e.g.
+`Authorization`) and dropped any prefix declared in the API definition (e.g. `Bearer`).
+The provider now emits a `HEADER_PREFIX` constant and prepends it to the header value,
+matching the behavior of the Java, Python, Go, C#, PHP, Rust, and Ruby v2 generators.
+
+
 ## 3.70.2
 **`(chore):`** Bump the typescript-sdk-validator container's `node:20-slim` base image
 to `node:22.22-bookworm-slim`. Node 20 went EOL March 24, 2026, and the