chore(deps): update helm chart cert-manager to v1.21.2

apps/templates/cert-manager-helm.yaml

@@ -12,7 +12,7 @@ spec:
   project: default
   source:
     repoURL: https://charts.jetstack.io
-    targetRevision: v1.15.5
+    targetRevision: v1.21.2
     chart: cert-manager
     helm:
       parameters:

apps/templates/external-secrets-helm.yaml

@@ -15,7 +15,7 @@ spec:
   sources:
     - chart: external-secrets
       repoURL: https://charts.external-secrets.io
-      targetRevision: 0.20.4
+      targetRevision: 0.10.7
   destination:
     server: https://kubernetes.default.svc
     namespace: external-secrets