Sorry for the problems.
The is is that a “require https” setting somehow got enabled for those XSD urls. We’re shifting our website hosting provider and despite the fact that we explicitly tested for this requirement on staging, something seems different in their new production settings. We’re actively working with them to resolve the problem.
In general, Liquibase should read the xsd files bundled in the jar rather than try to download them but there have been a few versions over the years which had a bug that caused them to pull them from the network.
Upgrading to the current 4.6.2 version will address it from whatever versions have the “download the xsd” bug. Switching the XSD URL in your file to https instead of http will work too. Otherwise, we should hopefully have the redirecting issue fixed on our our side soon.