Gemfile: bump to latest versions of vagrant and vagrant-libvirt

Must stay on f33 for now in build root because they aren't compatible
with ruby 3.0+ yet.

Gemfile

@@ -6,11 +6,11 @@ group :development do
   # We depend on Vagrant for development, but we don't add it as a
   # gem dependency because we expect to be installed within the
   # Vagrant environment itself using `vagrant plugin`.
-  gem "vagrant", :git => "https://github.com/mitchellh/vagrant.git", :ref => 'v2.2.9'
+  gem "vagrant", :git => "https://github.com/mitchellh/vagrant.git", :ref => 'v2.2.16'
 end
 
 group :plugins do
   # Add vagrant-libvirt plugin here, otherwise you won't be able to
   # use libvirt as a provider when you execute `bundle exec vagrant up`
-  gem "vagrant-libvirt" , '0.0.45'
+  gem "vagrant-libvirt" , '0.4.1'
 end

build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash -x
 set -ex
 
-ctr=$(buildah from registry.fedoraproject.org/fedora:31)
+ctr=$(buildah from registry.fedoraproject.org/fedora:33)
 
 rpms=(
   make gcc ruby ruby-devel redhat-rpm-config # for building gems