fix(helm): update chart cert-manager to v1.20.1

Author: roybatty-bot[bot]

cluster/core/cert-manager/helm-release.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: cert-manager
-      version: v1.20.0
+      version: v1.20.1
       sourceRef:
         kind: HelmRepository
         name: jetstack-charts