fix(base_system): improve the system-wide upgrade

When upgrading packages to their latest version, decide which Ansible
module to use based on the ‹pkg_mgr› Ansible fact instead of the
distribution.

This approach is more robust, and more correct, as the package managers
are shared between some of the distributions.

Signed-off-by: Matej Focko <me@mfocko.xyz>

roles/base_system/tasks/upgrade.yml

@@ -4,16 +4,16 @@
     name: "*"
     state: latest
     update_cache: true
-  when: ansible_distribution in [ "Debian", "Ubuntu" ]
+  when: ansible_facts.pkg_mgr == "apt"
 
 - name: Upgrade all packages with ‹dnf›
   ansible.builtin.dnf:
     name: "*"
     state: latest
-  when: ansible_distribution in [ "AlmaLinux", "CentOS", "Fedora" ]
+  when: ansible_facts.pkg_mgr == "dnf"
 
 - name: Upgrade all packages with ‹zypper›
   community.general.zypper:
     name: "*"
     state: latest
-  when: "'openSUSE' in ansible_distribution"
+  when: ansible_facts.pkg_mgr == "zypper"