added changelog entry

Author: ritamerkl

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -10,6 +10,9 @@ however, it has to be formatted properly to pass verification tests.
 
 ## [Unreleased] - yyyy-mm-dd
 
+### Fixed
+- Fixed an issue where the prompt to enable the InputSystem backends would interrupt the import of large assets. 
+
 ## [1.12.0] - 2025-01-15
 
 ### Fixed