ci: install latest vagrant

[crazy-max]

relates to #2904 (comment)

[crazy-max]

Installing latest vagrant now gives a 429 on GitHub Actions: https://github.com/docker/buildx/actions/runs/13243084931/job/36962873893#step:6:32 😞

Bringing machine 'default' up with 'libvirt' provider...
Warning: NING] Unrecognized arguments: libvirt_ip_command
==> default: Box 'generic/freebsd14' could not be found. Attempting to find and install...
    default: Box Provider: libvirt
    default: Box Version: >= 0
==> default: Loading metadata for box 'generic/freebsd14'
    default: URL: https://vagrantcloud.com/api/v2/vagrant/generic/freebsd14
==> default: Adding box 'generic/freebsd14' (v4.3.12) for provider: libvirt (amd64)
    default: Downloading: https://vagrantcloud.com/generic/boxes/freebsd14/versions/4.3.12/providers/libvirt/amd64/vagrant.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.
The requested URL returned error: 429
Error: Process completed with exit code 1.

So I guess we get rate limited 😢 https://developer.hashicorp.com/vagrant/vagrant-cloud/request-limits#how-do-i-know-if-i-have-been-rate-limited

Checking the headers on CI I get:

< location: https://vagrantcloud.com/generic/boxes/freebsd14/versions/4.3.12/providers/libvirt/amd64/download/vagrant.box
< access-control-allow-credentials: true
< cache-control: no-store, max-age=0
< grpc-metadata-content-type: application/grpc
< grpc-metadata-x-hcp-vagrant-box-registry-ratelimit-limit: 1995/2000
< grpc-metadata-x-hcp-vagrant-box-registry-ratelimit-name: global

But locally I've got x-hcp-vagrant-limit-boxdownloads-remain:

< vary: Accept-Encoding
< x-envoy-upstream-service-time: 3
< x-hcp-vagrant-limit-boxdownloads-remain: 0/20
< x-hcp-vagrant-limit-global-remain: 1957/2000
< x-hcp-vagrant-limit-retry-after: 1739203201

Seems containerd has the same issue: containerd/containerd#11364

Edit: seems fixed now: hashicorp/vagrant#13590 (comment)