Rewrite old release download links

[niloc132]

In 2018 Google announced that new goo.gl shortened links could no lo longer be created, but existing ones could continue to work (emphasis theirs):

While most features of goo.gl will eventually sunset, all existing links will continue to redirect to the intended destination.
...
After March 30, 2019, all links will continue to redirect to the intended destination.

As of this week, they're apparently walking that back, and intend to sunset all links in the next year.

these URLs will no longer return a response after August 25th, 2025

There will be a grace period of another ~35 days before some links will switch to an interstitial screen warning of this pending removal

Starting August 23, 2024, goo.gl links will start displaying an interstitial page for a percentage of existing links notifying your users that the link will no longer be supported after August 25th, 2025 prior to navigating to the original target page.

Apparently the goo.gl console is now redirecting to the blog post itself, rather than giving export data, so we'll need to follow the links and collect the redirect rather than using this tool.

Long, term, we should also relocate release artifacts to github releases - there seems no guarantee that the storage endpoints themselves won't disappear, but there's no sign of that happening in the near future.

[niloc132]

Looks like I forgot that I already fixed this - 4c2dd17 removes all goo.gl links for downloads. We still have one other goo.gl link, I'll make a simple PR to address that, and then this ticket can simply address relocating downloads to github releases.