chore(deps): update helm release cert-manager to v1.20.2 (#1515)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

kubernetes/apps/infrastructure/networking/cert-manager/cert-manager/app/helmrelease.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: cert-manager
-      version: v1.20.1
+      version: v1.20.2
       sourceRef:
         kind: HelmRepository
         name: jetstack