[DRE-maint] Bug#1092987: vagrant: free Vagrant versions no longer work with HashiCorp Cloud Platform's Vagrant registry

[Lucas Nussbaum]

Hi,

Regarding this specific issue, I used a patch from Fedora to change the
default server URL from https://vagrantcloud.com to
https://vagrantcloud.com/api/v2/vagrant.

I made uploads to unstable (2.3.7+git20230731.5fc64cde+dfsg-3) and
stable(-proposed-updates) (2.3.4+dfsg-1+deb12u1).

Note that if you have downloaded boxes locally in ~/.vagrant.d/boxes/
(which happens transparently when you 'vagrant up'), those boxes still
point to the old URL. You can remove those local copies with (for
example) 'vagrant box remove debian/bookworm64 --all'.

This is just a workaround but this buys us some time.

Lucas