Update changelogs from fern repo (#4366)

Co-authored-by: iamnamananand996 <31537362+iamnamananand996@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/rust/changelog/2026-03-19.mdx

@@ -0,0 +1,7 @@
+## 0.19.6
+**`(fix):`** Handle empty HTTP response bodies by returning an ApiError::Http instead of
+attempting JSON deserialization. Normalize HTTP(S) URLs to WS(S) schemes for
+WebSocket connections. Switch WebSocket server message enums to untagged serde
+representation.
+
+