Update changelogs from fern repo (#4421)

Author: fern-support

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

@@ -1,3 +1,13 @@
+## 2.44.0
+**`(feat):`** Add queued sending via `Channel<T>` to the WebSocket connection layer. Two
+unbounded channels (text and binary) are drained by dedicated background tasks
+started alongside the connection. The non-blocking `Send(string)` and `Send(byte[])`
+methods return `bool` indicating whether the message was queued, while the existing
+`SendInstant` async-per-send path remains unchanged. Queues are completed in `Dispose`
+before cancellation tokens are signalled. Drain loop errors are surfaced through the
+`ExceptionOccurred` event.
+
+
 ## 2.43.0
 **`(feat):`** Add per-message deflate compression support (RFC 7692) for WebSocket connections.
 A new `EnableCompression` option on the generated WebSocket Options class enables