update Azure.Security.CodeTransparency changelog for 1.0.0-beta.4 (#49763)

Author: ivarprudnikov

sdk/confidentialledger/Azure.Security.CodeTransparency/CHANGELOG.md

@@ -1,15 +1,11 @@
 # Release History
 
-## 1.0.0-beta.4 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 1.0.0-beta.4 (2025-05-06)
 
 ### Other Changes
 
+- Added `virtual` keyword to method `CodeTransparencyClient.RunTransparentStatementVerification`
+
 ## 1.0.0-beta.3 (2025-03-31)
 
 ### Features Added