chore(deps): update helm chart cert-manager to v1.21.1

apps/templates/cert-manager-helm.yaml

@@ -12,7 +12,7 @@ spec:
   project: default
   source:
     repoURL: https://charts.jetstack.io
-    targetRevision: v1.15.5
+    targetRevision: v1.21.1
     chart: cert-manager
     helm:
       parameters:

apps/templates/cloudnativepg-helm.yaml

@@ -10,7 +10,7 @@ spec:
   source:
     chart: cloudnative-pg
     repoURL: https://cloudnative-pg.github.io/charts
-    targetRevision: 0.29.0
+    targetRevision: 0.23.2
     helm:
       values: |
         # Default values are fine