playbooks: Remove unnecessary parameter

The documentation for Ansible's built-in 'package' module [1] says this
about the 'use' parameter:
  You should only use this field if the automatic selection is not
  working for some reason.

[1] https://docs.ansible.com/ansible/latest/collections/ansible/builtin/package_module.html

https://github.com/containers/toolbox/pull/1173

playbooks/dependencies.yaml

@@ -1,7 +1,6 @@
 - name: Install RPM packages
   become: yes
   package:
-    use: dnf
     name:
       - ShellCheck
       - bash-completion