Toolbox: update URLs for AzCopy (upstream change) - 17-6-stable

What does this MR do?

Toolbox: update URLs for AzCopy (upstream change)

Update the URLs for AzCopy downloads, as azureedge went away.

See upstream issue: https://github.com/Azure/azure-storage-azcopy/issues/2903

Related to #2136 (closed)

Changelog: changed

Related issues

Checklist

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