Add release notes for v0.226.0

Author: michaelhtm

docs/release_notes/0.226.0.md

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+# Release v0.226.0
+
+## 🚀 Features
+
+- Adding support for upgrading eks hybrid nodes on EKS clusters (#8719)
+- feat(ubuntu): add support for resolute (#8683)
+
+## 🐛 Bug Fixes
+
+- Populate role ARN from stack outputs on NoChangeError in pod identity update (#8717)
+- fix: only add ECR Public perms in aws partition (#8709)
+
+## 🧰 Maintenance
+
+- Update aws-node to v1.21.1 (#8541)
+- Update ec2-info (#8626)
+- Update nvidia-device-plugin to v0.19.0 (#8647)
+- Update coredns (#8699)
+
+## 📝 Documentation
+
+- fix: auto-detect system architecture instead of hardcoding (#8708)
+- karpenter: clarify createServiceAccount semantics in docs, schema, and runtime log (#8720)
+- Update Windows compatibility hint to recommend AL2023 instead of AL2 (#8714)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @cloudsmithy, @cs-mehta, @fletcherw, @guessi, @pokearu and @rpocase.
+