Update release notes (Azure#46362)

Author: zackliu

sdk/webpubsub/Microsoft.Azure.WebJobs.Extensions.WebPubSubForSocketIO/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 1.0.0-beta.4 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.0.0-beta.4 (2024-09-30)
 
 ### Bugs Fixed
 
-### Other Changes
+- Fix the issue that Python can't use return to ack message.
 
 ## 1.0.0-beta.3 (2024-09-24)