winget now supports alternate URLs for sources. Maybe I should try adding support for it, too?

Specifically, it's in this PR, and this line shows that it's https://winget.azureedge.net/cache and I think that's what it used to be but apparently that's still used behind the main CDN according to the PR's description:
https://github.com/microsoft/winget-cli/pull/2970/files#diff-b190f9ecbcb67a2c05bc153abbc7fb04a75acd53aa6e17defec01a3b470cdad4R36