distro/tests: update distributions

• update fedora to 33
• update ubuntu rolling to groovy

distro/tests/fedora33/Vagrantfile

@@ -5,10 +5,10 @@
 
 Vagrant.configure(2) do |config|
 
-    config.vm.box = "fedora/31-cloud-base"
+    config.vm.box = "fedora/33-cloud-base"
     config.vm.synced_folder ".", "/vagrant", disabled: true
 
-    config.vm.define "fedora31_knot-resolver"  do |machine|
+    config.vm.define "fedora33_knot-resolver"  do |machine|
         machine.vm.provision "ansible" do |ansible|
             ansible.playbook = "../knot-resolver-pkgtest.yaml"
             ansible.extra_vars = {