ci: trigger label-gated jobs

The Check workflow only runs on opened/synchronize/reopened, so the
Apple/Android/Ferric jobs gated on labels never evaluated the labels
added after the pull request was opened. This empty commit fires a
synchronize event so they run.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BAjP89a9VA9EtQsVBxGcto

Author: claude