updated changelog for v2.6.0

Author: auvipy

Changelog

@@ -4,6 +4,24 @@
  Change history
 ================
 
+.. _version-2.6.0:
+
+2.6.0
+=====
+:release-date: 2025-04-10 2:15 P.M. UTC+6:00
+:release-by: Asif Saif Uddin
+
+- Fix atomic transaction not routing to the the correct DB in DatabaseBackend (#427).
+- Store current time when TaskResult started (#432).
+- Added extra except clause to TryRemoveIndex.
+- Fix for missing periodic task name (#445).
+- Update behavior of app.result_expires to match celery docs.
+- Added index to periodic_task_name.
+- Added support for Django up to 5.2.
+- Added support for python up to 3.13.
+- fix: allow for custom states in status field (#407).
+
+
 .. _version-2.5.1:
 
 2.5.1