chore(nuget): `https://nuget.blazor.zone/v3/index.json` 404

[ice6]

404: https://nuget.blazor.zone/v3/index.json

[bb-auto]

@ice6 Thank you for submitting. We will give feedback later.

[ArgoZhang]

@ice6 thank you submit issue. Which configuration requires this source? This server expired, and I thought it wasn't needed, so I didn't migrate it.

[ice6]

@ArgoZhang ok, I will remove source ref from my nuget.config. I should have no use now.