Add changelog for CAPZ v1.13.3

Author: mboersma

CHANGELOG/v1.13.3.md

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+## Changes by Kind
+
+### Bug Fix or Regression
+
+- Set `PrincipalType` in RoleAssignment creation API call when using `SystemAssigned` identity. ([#4664](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/4664), [@whites11](https://github.com/whites11))
+
+### Other (Cleanup or Flake)
+
+- Bump CAPI to v1.6.3 ([#4645](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/4645), [@mboersma](https://github.com/mboersma))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+- google.golang.org/protobuf: v1.31.0 → v1.33.0
+- sigs.k8s.io/cluster-api/test: v1.6.2 → v1.6.3
+- sigs.k8s.io/cluster-api: v1.6.2 → v1.6.3
+
+### Removed
+_Nothing has changed._
+
+## Details
+<!-- markdown-link-check-disable-next-line -->
+https://github.com/kubernetes-sigs/cluster-api-provider-azure/compare/v1.13.2...v1.13.3