Bump eventrouter to v0.3.2 with bci 15.6 (backport #839)

[mergify]

Problem:

Bump eventrouter image base from bci 15.5 to 15.6

Solution:

Bump eventrouter image base from bci 15.5 to 15.6

Related Issue:
harvester/harvester#6568

container image bump: harvester/eventrouter#12

Test plan:

1. Install new cluster
2. Enable rancher-logging addon
3. check eventrouter pod is normally running with tag v0.3.2
4. it's pod log (kubectl logs -n cattle-logging-system harvester-default-event-tailer-0) has things like

{"verb":"ADDED","event":{"metadata":{"name":"pvc-99b647d2-d7d0-46d1-998a-13a3cf3a8f02.17f64d4708a92b3c","namespace":"longhorn-system","uid":"9cc92ef2-77ac-48ac-af74-c5e576664456","resourceVersion":"287702","creationTimestamp":"2024-09-18T09:41:14Z","managedFields":[{"manager":"longhorn-manager","operation":"Update","apiVersion":"v1","time":"2024-09-18T09:41:14Z","fieldsType":"FieldsV1","fieldsV1":{"f:count":{},"f:firstTimestamp":{},"f:involvedObject":{},"f:lastTimestamp":{},"f:message":{},"f:reason":{},"f:reportingComponent":{},"f:source":{"f:component":{}},"f:type":{}}}]},"involvedObject":{"kind":"Volume","namespace":"longhorn-system","name":"pvc-99b647d2-d7d0-46d1-998a-13a3cf3a8f02","uid":"69a70ed3-ca31-4863-b64c-ed7d0359224f","apiVersion":"longhorn.io/v1beta2","resourceVersion":"287636"},"reason":"Degraded","message":"volume pvc-99b647d2-d7d0-46d1-998a-13a3cf3a8f02 became degraded","source":{"component":"longhorn-volume-controller"},"firstTimestamp":"2024-09-18T09:41:14Z","lastTimestamp":"2024-09-18T09:41:14Z","count":1,"type":"Normal","eventTime":null,"reportingComponent":"longhorn-volume-controller","reportingInstance":""}}

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This is an automatic backport of pull request #839 done by [Mergify](https://mergify.com).