Add release notes for CAPZ v1.20.2

Author: mboersma

CHANGELOG/v1.20.2.md

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+## Changes by Kind
+
+### Bug or Regression
+
+- Adds the ability to disable CAPZ components through a manager flag. Flags added for disabling ASO Secret Controller and disabling Azure JSON Machine Controller. ([#5758](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/5758), [@bryan-cox](https://github.com/bryan-cox))
+
+### Other (Cleanup or Flake)
+
+- Bump CAPI to v1.10.4 ([#5771](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/5771), [@mboersma](https://github.com/mboersma))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+- github.com/go-viper/mapstructure/v2: [v2.2.1 → v2.3.0](https://github.com/go-viper/mapstructure/compare/v2.2.1...v2.3.0)
+- sigs.k8s.io/cluster-api/test: v1.10.3 → v1.10.4
+- sigs.k8s.io/cluster-api: v1.10.3 → v1.10.4
+
+### Removed
+_Nothing has changed._
+
+## Details
+<!-- markdown-link-check-disable-next-line -->
+https://github.com/kubernetes-sigs/cluster-api-provider-azure/compare/v1.20.1...v1.20.2