Update changelogs from fern repo (#5629)

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

Author: fern-support

fern/products/sdks/generators/go/changelog/2026-05-27.mdx

@@ -0,0 +1,9 @@
+## 1.43.0
+**`(feat):`** Expose `Stream[T].LastRetryMs()` on the SSE runtime, mirroring `LastEventID()`.
+It returns the most recently advertised `retry:` reconnection time in
+milliseconds (sticky per the SSE spec), so callers can read the directive
+even when the server sends it in its own frame with no `data:` — in which
+case the per-event `StreamEvent.Retry` is 0. The value persists across
+reconnects.
+
+