`cygwin/cygwin-install-action` can fail to connect to server

[zanieb]

https://github.com/astral-sh/python-build-standalone/actions/runs/12577525900/job/35055102424

Run cygwin/cygwin-install-action@49f298a7ebb00d4b3ddf58000c3e78eff5fbd6b9
Run $platform = 'x86_64'
Invoke-WebRequest : Unable to connect to the remote server
At C:\a\_temp\573ecf8c-e1b7-4c1c-b52a-a3b1e2d850ca.ps1:10 char:1
+ Invoke-WebRequest https://cygwin.com/setup-$platform.exe -OutFile C:\ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebExc 
   eption
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand