Add release v1.5.6

CHANGELOG/v1.5.6.md

@@ -0,0 +1,24 @@
+## 👌 Kubernetes version support
+
+- Management Cluster: v1.24.x -> v1.28.x
+- Workload Cluster: v1.22.x -> v1.28.x
+
+[More information about version support can be found here](https://cluster-api.sigs.k8s.io/reference/versions.html)
+
+## Changes since v1.5.5
+## :chart_with_upwards_trend: Overview
+- 6 new commits merged
+- 1 bug fixed 🐛
+
+## :bug: Bug Fixes
+- ClusterCacheTracker: Fix ClusterCacheTracker memory leak (#10065)
+
+## :seedling: Others
+- clusterctl: Bump cert-manager to v1.14.1 (#10121)
+- Community meeting: Promote chrischdi to Cluster API maintainer (#10090)
+- Dependency: Bump Go to 1.21.5 (#10153)
+
+:book: Additionally, there has been 1 contribution to our documentation and book. (#10117) 
+
+
+_Thanks to all our contributors!_ 😊