fix: check ip version if settings.useStaticServer

[khendrikse]

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Summary

This hopefully fixes this: https://answers.netlify.com/t/128792

I noticed, while running this on windows in a VM, that the proxy was trying to connect to an IPv4 server, while the static server was actually an IPv6 one.

With this logic, we explicitly check what version we are running within the settings.useStaticServer branch of logic as well.

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[khendrikse]

Were you able to see the failure in the CI? Any chance we could add a test to verify it's fixed?

No we didn't see it, but I'm going to try out running tests on win + node 23 in the pipelines. Wish me luck lol.