roles: strict truthy values

According to Ansible we can use yes, true, True, "or any quoted st-
ring" for a boolean true, but ansible-lint wants us to use either
true or false.

See: https://chronicler.tech/red-hat-ansible-yes-no-and/

roles/common/handlers/main.yml

@@ -11,7 +11,7 @@
   ansible.builtin.systemd: name=firewalld state=restarted
 
 - name: reload systemd
-  ansible.builtin.systemd: daemon_reload=yes
+  ansible.builtin.systemd: daemon_reload=true
 
 - name: restart nftables
   ansible.builtin.systemd: name=nftables state=restarted