Update Helm release cert-manager to v1.19.4

Author: renovate[bot]

infra/argo-apps/cert-manager.yaml

@@ -17,7 +17,7 @@ spec:
           prometheus:
             enabled: false
       repoURL: https://charts.jetstack.io
-      targetRevision: v1.19.2
+      targetRevision: v1.19.4
     - repoURL: https://github.com/code4romania/code4ro-k8s.git
       path: infra/cert-manager
       targetRevision: HEAD