chore: changelog for #2494

Author: vmaerten

CHANGELOG.md

@@ -15,6 +15,7 @@
   parts won't be mixed up from different tasks (#1208, #2349, #2350 by
   @trulede).
 - Do not re-evaluate variables for `defer:` (#2244, #2418 by @trulede).
+- Improve error message when a Taskfile is not found (#2441, #2494 by @vmaerten).
 
 ## v3.45.4 - 2025-09-17