Add release notes for v0.208.0

Author: cheeseandcereal

docs/release_notes/0.208.0.md

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+# Release v0.208.0
+
+## 🚀 Features
+
+- Enable enclave options in EC2 Launch Template (#8349)
+- Add support for AL2023 arm64 nvidia amiType  (#8351)
+
+## 🧰 Maintenance
+
+- Drop support for Ubuntu 18.04 images (#8344)
+
+## Acknowledgments
+
+The eksctl maintainers would like to sincerely thank @naclonts, @ndbaker1, @tarikdem and @toabctl.
+