Update dependency cert-manager to v1.15.0

Author: renovate[bot]

CHANGELOG.md

@@ -9,7 +9,7 @@
 
   - kube-vip: 0.8.0
 
-  - cert-manager version: 1.14.1
+  - cert-manager version: 1.15.0
 
   - rancher version: 2.8.1
 

README.md

@@ -18,7 +18,7 @@ This Ansible collection will install in airgap environnement RKE2 (one controler
 
 - [Kube-vip 0.8.0](https://kube-vip.io/) - Virtual IP and load balancer
 
-- [Cert-manager 1.14.1](https://cert-manager.io/docs/) - Certificate manager
+- [Cert-manager 1.15.0](https://cert-manager.io/docs/) - Certificate manager
 
 - [Rancher 2.8.1](https://www.suse.com/products/suse-rancher/) - Multi-Cluster Kubernetes Management