v0.19.3

What's Changed

• 🐛 Refactor certificate watcher to use polling, instead of fsnotify by @k8s-infra-cherrypick-robot in #3023
• 🐛 Use leader elector with client timeout by @k8s-infra-cherrypick-robot in #3031

Full Changelog: v0.19.2...v0.19.3