fix: quote awk command in gpu_groups.yml to fix YAML parsing

The unquoted colon in `awk -F:` caused Ansible YAML parser to fail
with "Colons in unquoted values must be followed by a non-space
character" during Packer desktop template build.

Author: Derek

ansible/roles/rdp/tasks/gpu_groups.yml

@@ -31,7 +31,7 @@
 
 - name: Get list of non-system users (UID 1000-60000)
   ansible.builtin.shell:
-    cmd: awk -F: '$3 >= 1000 && $3 < 60000 && $1 != "nobody" {print $1}' /etc/passwd
+    cmd: "awk -F: '$3 >= 1000 && $3 < 60000 && $1 != \"nobody\" {print $1}' /etc/passwd"
   register: non_system_users
   changed_when: false
   when: