Add release v1.4.7

CHANGELOG/v1.4.7.md

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+## 👌 Kubernetes version support
+
+- Management Cluster: v1.23.x -> v1.27.x
+- Workload Cluster: v1.21.x -> v1.27.x
+
+[More information about version support can be found here](https://cluster-api.sigs.k8s.io/reference/versions.html)
+
+## Changes since v1.4.6
+---
+## :chart_with_upwards_trend: Overview
+- 10 new commits merged
+- 2 bugs fixed 🐛
+
+## :bug: Bug Fixes
+- KCP: Fix KCP Controller reconcile always return error when workload cluster is unreachable (#9450)
+- MachineHealthCheck: Fix excessive trace logging in the machine health check controller (#9427)
+
+## :seedling: Others
+- Dependency: Bump cert-manager to v1.13.0 (#9414)
+- Dependency: Bump to Go 1.20.8 (#9432)
+- KCP: Remove redundant GetRESTConfig in KCP Management.GetWorkloadCluster (#9453)
+
+:book: Additionally, there have been 3 contributions to our documentation and book. (#9366, #9431, #9492) 
+
+
+_Thanks to all our contributors!_ 😊