Add release notes for v0.176.0 (eksctl-io#7672)

Co-authored-by: TiberiuGC <[email protected]>

docs/release_notes/0.176.0.md

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+# Release v0.176.0
+
+## 🚀 Features
+
+- Add support for AMIs based on AmazonLinux2023 (#7684)
+
+## 🎯 Improvements
+
+- Display full draft release notes in PR description (#7686)
+
+## 🐛 Bug Fixes
+
+- Enforce `authenticationMode:CONFIG\_MAP` on Outposts (#7699)
+- [EKSCTL create cluster command] Authorise self-managed nodes via `aws-auth configmap` when EKS access entries are disabled (#7698)
+- Allow GPU instance types for Windows nodes (#7681)
+- Include MixedInstancesPolicy LaunchTemplate for validation (#7661)
+- Aim for namespace uniqueness across parallel integration tests specs (#7680)
+
+## 🧰 Maintenance
+
+- Bump mkdocs version (#7696)
+- Bump dependencies (#7668)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @qclaogui.
+