Automatic merge from submit-queue (batch tested with PRs 49855, 49915)

update dashboard image version

fix https://github.com/kubernetes/kubernetes/issues/50195
**What this PR does / why we need it:**
Updates dashboard addon to latest version. Changelog can be found [here](https://github.com/kubernetes/dashboard/releases/tag/v1.6.3).

**Release note:**
```
Update dashboard version to v1.6.3
```