v4.28.0
Prepare for v4.28.0 release (#4230) ## Summary - Add v4.28.0 release heading to CHANGELOG ## Changes in this release - Upgrade Kubernetes schema and libraries to v1.35.2 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>