The remote server returned an error: (503) Server Unavailable | https://json.schemastore.org/

### Is there an existing issue for this?

- [ ] I have searched the existing issues

### Describe the bug

Unable to build my project as the https://json.schemastore.org/ site is down and Aspire does not have a non blocking fallback for when this happens.

https://github.com/SchemaStore/schemastore/pull/5105

I would reopen this previous issue from last year but I don't seem to be able to:
https://github.com/dotnet/aspire/issues/2638

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Exceptions (if any)

_No response_

### .NET Version info

_No response_

### Anything else?

_No response_