Clean up packages

[kylewlacy]

This PR includes some general minor cleanup across lots of packages:

• Update brioche.lock for go package. I missed this before merging [go] Improve Go package and update to v1.23.1 #111
• Update all remaining std.download() recipes to use Brioche.download() where possible (this was supposed to be done in Update all packages to use Brioche.download where possible #104 but quite a few packages were missed)
• Switch to using .unarchive() in places where a workaround was needed due to Failed to peel the archive from ruff brioche#103
• Update k9s package to use Brioche.gitRef() + gitCheckout(). This ensures that the git commit hash for the build matches the actual source code commit
• Use export default function () { ... } instead of export default () => { ... }; everywhere
  • This isn't a "set in stone" decision, but I'd prefer to stick to one in the packages repo, and I believe export default function () { ... } has the edge (namely: you can define a function that is both exported as the default and has a local name, see this diff from go for an example). Open to bikeshedding on this though!