Add changelog entry

Author: momo3404

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## v5.0.2
 - Bump Ruby to v3.1.4 and use `.ruby-version` in CI [#3566](https://github.com/DMPRoadmap/roadmap/pull/3566)
+- Enable session timeout after 90 minutes of inactivity [#3568](https://github.com/DMPRoadmap/roadmap/pull/3568)
 
 ## v5.0.1
 - Updated seeds.rb file for identifier_schemes to include context value and removed logo_url and idenitifier_prefix for Shibboleth (as it was causing issues with SSO). [#3525](https://github.com/DMPRoadmap/roadmap/pull/3525)