Add release notes for v0.216.0

Author: NicholasBlaskey

docs/release_notes/0.216.0.md

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+# Release v0.216.0
+
+## 🚀 Features
+
+- Add support for ap-southeast-6 (#8544)
+- feat: add support for UpgradePolicy attribute in cluster creation (#8534)
+
+## 🎯 Improvements
+
+- Migrate completly off V1 SDK to V2 SDK (#8548)
+
+## 🐛 Bug Fixes
+
+- Make metrics server create after node groups so it can get scheduled … (#8538)
+
+## 🧰 Maintenance
+
+- Migrate completly off V1 SDK to V2 SDK (#8548)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @NicholasBlaskey and @guessi.
+