Upgrade fedora version in vagrant file

The Fedora version 36 should be upgraded to a
recent version (e.g.: 38) to prevent possible
errors.

Signed-off-by: Carla Martinez <carlmart@redhat.com>

Vagrantfile

@@ -3,7 +3,7 @@
 
 Vagrant.configure("2") do |config|
   config.vm.hostname = "server.ipa.demo"
-  config.vm.box = "fedora/36-cloud-base"
+  config.vm.box = "fedora/38-cloud-base"
 
   config.vm.synced_folder ".", "/vagrant", disabled: true
   config.vm.synced_folder ".", "/usr/src/freeipa-webui"