Add changelog entry for #7608 [ci skip]

Author: OTP Changelog Bot

doc/user/Changelog.md

@@ -50,6 +50,7 @@ based on merged pull requests. Search GitHub issues and pull requests for smalle
 - Fix negative costs for steep bicycle and walk edges [#7579](https://github.com/opentripplanner/OpenTripPlanner/pull/7579)
 - Fix board stop for pass-through connections [#7592](https://github.com/opentripplanner/OpenTripPlanner/pull/7592)
 - Add Preparing DEM Data documentation page [#7606](https://github.com/opentripplanner/OpenTripPlanner/pull/7606)
+- Fix thread-safety bug in DefaultDataImportIssueStore [#7608](https://github.com/opentripplanner/OpenTripPlanner/pull/7608)
 [](AUTOMATIC_CHANGELOG_PLACEHOLDER_DO_NOT_REMOVE)
 
 ## 2.9.0 (2026-03-18)