Update changelogs from fern repo (#4424)

Co-authored-by: Swimburger <3382717+Swimburger@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx

@@ -1,3 +1,9 @@
+## 2.45.1
+**`(fix):`** Fix sticky compression on reconnect. `DeflateOptions` is now explicitly reset to
+`null` when `EnableCompression` is `false`, preventing a previous non-null value
+from persisting across connection cycles.
+
+
 ## 2.45.0
 **`(feat):`** Add `InjectTestMessage` internal method to generated WebSocket client classes.
 This allows unit tests to simulate incoming WebSocket messages by injecting raw