fix(container): update image docker.io/rancher/system-upgrade-controller ( v0.15.2 → v0.15.3 )

| datasource | package                                     | from    | to      |
| ---------- | ------------------------------------------- | ------- | ------- |
| docker     | docker.io/rancher/system-upgrade-controller | v0.15.2 | v0.15.3 |

Author: renovate[bot]

kubernetes/cluster-0/apps/system-upgrade/system-upgrade-controller/app/helmrelease.yaml

@@ -35,7 +35,7 @@ spec:
           app:
             image:
               repository: docker.io/rancher/system-upgrade-controller
-              tag: v0.15.2
+              tag: v0.15.3
             env:
               SYSTEM_UPGRADE_CONTROLLER_LEADER_ELECT: true
               SYSTEM_UPGRADE_CONTROLLER_NAME: system-upgrade-controller