Add release notes for v1.17.3

Author: willie-yao

CHANGELOG/v1.17.3.md

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+## Changes by Kind
+
+### Other (Cleanup or Flake)
+
+- Update CAPZ rel-1.7 with CAPI-1.8.8 ([#5376](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/5376), [@nawazkh](https://github.com/nawazkh))
+- Improves state update handling when running long operations on VMSS ([#5327](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/5328), [@mweibel](https://github.com/mweibel))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+- github.com/coredns/corefile-migration: [v1.0.23 → v1.0.24](https://github.com/coredns/corefile-migration/compare/v1.0.23...v1.0.24)
+- golang.org/x/crypto: v0.27.0 → v0.31.0
+- golang.org/x/net: v0.28.0 → v0.33.0
+- golang.org/x/sync: v0.8.0 → v0.10.0
+- golang.org/x/sys: v0.25.0 → v0.28.0
+- golang.org/x/term: v0.24.0 → v0.27.0
+- golang.org/x/text: v0.18.0 → v0.21.0
+- sigs.k8s.io/cluster-api/test: v1.8.5 → v1.8.8
+- sigs.k8s.io/cluster-api: v1.8.5 → v1.8.8
+- sigs.k8s.io/controller-runtime: v0.18.5 → v0.18.6
+
+### Removed
+_Nothing has changed._
+
+## Details
+<!-- markdown-link-check-disable-next-line -->
+https://github.com/kubernetes-sigs/cluster-api-provider-azure/compare/v1.17.2...v1.17.3