chore(deps): update goharbor/harbor-exporter docker tag to v2.15.0

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| goharbor/harbor-core | minor | `v2.14.3` → `v2.15.0` |

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>
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Reviewed-on: #4779
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clusters/cl01tl/helm/harbor/values.yaml

@@ -46,7 +46,7 @@ harbor:
   core:
     image:
       repository: goharbor/harbor-core
-      tag: v2.14.3
+      tag: v2.15.0
     replicas: 2
     existingSecret: harbor-secret
     secretName: harbor-secret