Update Changelog with current (interesting) changes

Author: vmcj

ChangeLog

@@ -2,6 +2,11 @@ DOMjudge Programming Contest Judging System
 
 Version 10.0.0DEV
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+ - Removed support for multiple endpoints from judgedaemon.
+ - Remove support for cgroup v1.
+ - Various fixes to the Monaco submission comparison viewer.
+ - Drop support for PHP 8.1, upgraded to Symfony 7.4.
+ - Allow LaTeX inline math in clarifications.
 
 Version 9.0.0 - 5 October 2025
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