feat(helm): update chart cert-manager to v1.15.0 (#6377)

| datasource | package      | from    | to      |
| ---------- | ------------ | ------- | ------- |
| helm       | cert-manager | v1.14.5 | v1.15.0 |

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

Author: renovate[bot]

kubernetes/main/apps/cert-manager/app/helmrelease.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: cert-manager
-      version: v1.14.5
+      version: v1.15.0
       sourceRef:
         kind: HelmRepository
         name: jetstack-charts