Update release notes for version 4.3.0-beta.4 (#6558)

* Update release notes for version 4.3.0-beta.4

* Updated Features Added

Author: gearama

sdk/keyvault/azure-security-keyvault-certificates/CHANGELOG.md

@@ -1,14 +1,11 @@
 # Release History
 
-## 4.3.0-beta.4 (Unreleased)
+## 4.3.0-beta.4 (2025-05-06)
 
 ### Features Added
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
+- Added support for `PreserveCertificateOrder` option.
+- Updated API version to `7.6-preview.2`.
 
 ## 4.3.0-beta.3 (2025-04-08)