Merge pull request #4720 from jackfrancis/release-notes-v1.13.4

Add release notes for v1.13.4

Author: k8s-ci-robot

CHANGELOG/v1.13.4.md

@@ -0,0 +1,16 @@
+## Changes by Kind
+
+### Bug or Regression
+
+- Enable per-sub msi client ([#4716](https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/4716), [@k8s-infra-cherrypick-robot](https://github.com/k8s-infra-cherrypick-robot))
+
+## Dependencies
+
+### Added
+_Nothing has changed._
+
+### Changed
+_Nothing has changed._
+
+### Removed
+_Nothing has changed._