Update changelog for v3.28.7 release

Author: mrubens

.changeset/v3.28.7.md

@@ -8,4 +8,3 @@
 - Fix: Resolve checkpoint restore popover positioning issue (#8219 by @NaccOll, PR by @app/roomote)
 - Add cloud account switcher functionality (thanks @mrubens!)
 - Add support for zai-org/GLM-4.5-turbo model in Chutes provider (#8155 by @mugnimaestra, PR by @app/roomote)
-- Add release image for v3.28.5 (thanks @mrubens!)