Velero update to 1.6.3

Package Owner Merge Request

Package Changes

• bump velero image to 1.6.3
• upstream chart to 2.23.6
• added 15 second wait to CI for testing

Links to all MRs that are associated with this change are required.

https://repo1.dso.mil/platform-one/big-bang/apps/cluster-utilities/velero/-/merge_requests/19

Additional Details

Closes #702 (closed)