fix date in changelog

Author: myrho

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [25.11.5/1.15.5] - 2025-12-11
+## [25.11.5/1.15.5] - 2026-01-07
 ### removed
 -  removed "Content-Disposition" header from bulk endpoints