Remove CHANGES.md entries which sneaked in during a backport

CHANGES.md

@@ -7,9 +7,6 @@ Changes
 ### Unreleased
 
 * 2024-12-06 - Tests: Add several Behat optimisations to bring down the test suite run time, resolves #765.
-* 2024-12-06 - Upstream change: Adopt changes from MDL-83759 ('System notification navbar popover is misplaced in Moodle 4.4 and 4.5')
-* 2024-12-06 - Upstream change: Adopt changes from MDL-75610 ('Quiz activity name no longer being displayed in quiz landing page when using Safe Exam Browser'), resolves #766.
-* 2024-11-19 - Bugfix: Port the activity icon sizes in the nav drawer back to stable versions, resolves #755.
 
 ### v4.1-r33