[PLT-4135] Remove CHANGELOG entry from feature PR

Changelog updates belong in the release Prep PR per the Python SDK release runbook.

Author: pawelkozik-labelbox

libs/labelbox/CHANGELOG.md

@@ -1,8 +1,4 @@
 # Changelog
-# Version 7.11.0 (Unreleased)
-## Added
-* Add `User.last_login_at` to expose GraphQL `lastLoginAt` (nullable datetime of last session in the organization) ([#TBD](https://github.com/Labelbox/labelbox-python/pull/TBD))
-
 # Version 7.10.0 (2026-07-22)
 ## Added
 * Add `Tool.Type.MARKER` for video marker tool ontologies — fetching an ontology containing a marker tool no longer raises `ValueError` ([#2067](https://github.com/Labelbox/labelbox-python/pull/2067))