Fix the --insecure flag issue by disabling ATS in Info.plist

[JeckLabs]

After upgrading tart to version 2.7.0, I encountered an issue with the --insecure flag.

➜  ~ tart push tart-build --insecure macregistry.example.com/macos/sonoma
pushing tart-build to macregistry.example.com/macos/sonoma:latest...
pushing config...
Error: The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

I managed to fix it by disabling App Transport Security. I'm not sure this is the best approach, but right now, --insecure is broken.

Fixes #761

[CLAassistant]

All committers have signed the CLA.

[fkorotkov]

Thank you for investigating it and finding out a fix. LGTM.