Update vagrant and vagrant-libvirt in Gemfile

These are the current versions in Fedora 31.

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 => 'v2.0.2'
+  gem "vagrant", :git => "https://github.com/mitchellh/vagrant.git", :ref => 'v2.2.6'
 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" , '0.0.43'
+  gem "vagrant-libvirt" , '0.0.45'
 end