Update CHANGELOG.md to move changes to v1.5.2 section

Co-authored-by: YunchuWang <[email protected]>

Author: Copilot

CHANGELOG.md

@@ -1,11 +1,9 @@
-## Unreleased
-* Update dependencies to fix CVE vulnerabilities:
+## v1.5.2
+* Update dependencies to fix CVE vulnerabilities ([#226](https://github.com/microsoft/durabletask-java/pull/226))
   * Update gRPC from 1.59.0 to 1.62.2
   * Update Jackson from 2.15.3 to 2.16.1
   * Update Azure Core from 1.45.0 to 1.46.0
   * Update Azure Identity from 1.11.1 to 1.11.2
-
-## v1.5.2
 * Add distributed tracing support for Azure Functions client scenarios ([#211](https://github.com/microsoft/durabletask-java/pull/211))