Nightlies page has old windows installers

[RandomString123]

The Windows download from the nightlies page on julialang.org https://julialang.org/downloads/nightlies.html has a version that is now 3 weeks old. I think the process to get the nightly binaries there is broken. I noticed this when tests / warnings in my local environment were not matching those produced by travis CI.

[ararslan]

There are some unresolved issues with the Windows buildbots. We'll try to get them back up ASAP.

[staticfloat]

X-Ref: #25574

[StephenVavasis]

For the past two days, I haven't been able to download a Win64 .exe nightly at all (even an outdated one); the link is broken. Is the broken link a symptom of this same issue?