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
+
+- Fix upgrade vpc-cni test relying on assumptions about vpc versions (#8562)
+- Fix integration test by waiting 2 minutes for ebs update (#8561)
+- Fix test failure for add-on waiting for ebs csi driver (#8559)
+- For dns test, use an ECR busybox image (#8560)
+- Don't check access entry length to fix failed intg test (#8558)
+- Don't wait for metrics-server if its the only add-on (#8552)
+- Migrate completly off V1 SDK to V2 SDK (#8548)
+
+## 🐛 Bug Fixes
+
+- Make update kube-proxy not use minimal images for >= 1.34 (#8557)
+- Remove kubernetes.io/cluster/\<clusterName> tag from EFA security group (#8556)
+- Create EFA specific security group for self-managed node groups always (#8554)
+- Make metrics server create after node groups so it can get scheduled … (#8538)
+
+## 🧰 Maintenance
+
+- Don't check access entry length to fix failed intg test (#8558)
+- Update coredns (#8537)
+- Migrate completly off V1 SDK to V2 SDK (#8548)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @NicholasBlaskey and @guessi.
+