Remove/update outdated example boxes and add centos9-proxy-devel

Author: ianballou

vagrant/boxes.d/99-local.yaml.example

@@ -15,7 +15,7 @@ centos9-katello-devel:
       katello_repositories_version: nightly
       foreman_installer_options:
         - "--foreman-proxy-content-enable-ostree=true"
-        - "--katello-devel-modulestream-nodejs=18"
+#        - "--katello-devel-modulestream-nodejs=18"
 
 almalinux8-katello-devel:
   primary: true
@@ -48,6 +48,13 @@ almalinux8-hammer-devel:
     variables: # defaults in roles/hammer_devel/defaults/main.yml
       #hammer_devel_server: almalinux8-katello-devel.custom-domain.example.com
 
+centos9-proxy-devel:
+    box: centos9-stream
+    ansible:
+      playbook: 'playbooks/foreman_proxy_content_dev.yml'
+      group: 'foreman-proxy-content'
+      server: 'centos9-katello-devel'
+
 almalinux8-proxy-devel:
     box: almalinux8
     ansible: