docs: add changelog entry for hiding update toast on askgithub

Co-authored-by: Michael Sukkarieh <msukkari@users.noreply.github.com>

Author: cursoragent

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added PostHog events for chat UI interactions (details card expand/collapse, copy answer, table of contents toggle) and repo tracking in `wa_chat_message_sent`. [#922](https://github.com/sourcebot-dev/sourcebot/pull/922)
 - Added Bitbucket Cloud OAuth identity provider support (`provider: "bitbucket-cloud"`) for SSO and account-linked permission syncing. [#924](https://github.com/sourcebot-dev/sourcebot/pull/924)
 
+### Changed
+- Hide version upgrade toast for askgithub deployment (`EXPERIMENT_ASK_GH_ENABLED`).
+
 ## [4.11.7] - 2026-02-23
 
 ### Changed