Merge pull request #4988 from mboersma/changelog-v1.15.3

Add changelog for v1.15.3

CHANGELOG/v1.15.3.md

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+## Changes by Kind
+
+### Bug or Regression
+
+- Fixed a bug causing ASO and non-AKS-native autoscalers to fight over the replica count of an AzureASOManagedMachinePool ([#4935](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/4935), [@nojnhuh](https://github.com/nojnhuh))
+
+### Other (Cleanup or Flake)
+
+- Bump CAPI to v1.7.4 ([#4979](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/4979), [@mboersma](https://github.com/mboersma))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+- sigs.k8s.io/cluster-api/test: v1.7.3 → v1.7.4
+- sigs.k8s.io/cluster-api: v1.7.3 → v1.7.4
+
+### Removed
+_Nothing has changed._
+
+## Details
+<!-- markdown-link-check-disable-next-line -->
+https://github.com/kubernetes-sigs/cluster-api-provider-azure/compare/v1.15.2...v1.15.3