Add release notes for v0.203.0 (#8154)

Add notes for v0.203.0

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

Author: eksctl-bot

docs/release_notes/0.203.0.md

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+# Release v0.203.0
+
+## 🎯 Improvements
+
+- [Hybrid Nodes] Remove strict requirement of providing a VGW or TGW during cluster creation (#8168)
+
+## 🐛 Bug Fixes
+
+- Resolve clusterDNS for IPv6 MNG AL2023 with custom AMI (#8170)
+- [Hybrid Nodes] Make `remoteNetworkConfig.IAM.Provider` field case insensitive (#8169)