scripts/ci: use F34 image instead of F33

Now that F34 has been released, it's time to update the CI Vagrantfile
to use the new Fedora version. This also fixes the failure in the
recently added vsock_socket test that depends on a bugfix, which made it
to the F34 image's kernel, but is not in the F33 image's.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Petr Lautrbach <plautrba@redhat.com>

scripts/ci/Vagrantfile

@@ -34,7 +34,7 @@ SCRIPT
 # backwards compatibility). Please don't change it unless you know what
 # you're doing.
 Vagrant.configure("2") do |config|
-  config.vm.box = "fedora/33-cloud-base"
+  config.vm.box = "fedora/34-cloud-base"
   config.vm.synced_folder "../..", "/root/selinux"
 
   config.vm.provider "virtualbox" do |v|