roles/common: re-format handlers

Use the newer Ansible format.

roles/common/handlers/main.yml

@@ -2,19 +2,26 @@
 # ansible.builtin.file: roles/common/handlers/main.yml
 
 - name: reload sshd
-  ansible.builtin.systemd: name={{ sshd_service_name }} state=reloaded
+  ansible.builtin.systemd:
+    name: "{{ sshd_service_name }}"
+    state: reloaded
 
 - name: reload sysctl
   command: sysctl -p /etc/sysctl.conf
 
 - name: reload systemd
-  ansible.builtin.systemd: daemon_reload=true
+  ansible.builtin.systemd:
+    daemon_reload: true
 
 - name: restart nftables
-  ansible.builtin.systemd: name=nftables state=restarted
+  ansible.builtin.systemd:
+    name: nftables
+    state: restarted
 
 # 2021-09-28: note to self to keep fail2ban at the end, as handlers are executed
 # in the order they are defined, not in the order they are listed in the task's
 # notify statement and we must restart fail2ban after updating the firewall.
 - name: restart fail2ban
-  ansible.builtin.systemd: name=fail2ban state=restarted
+  ansible.builtin.systemd:
+    name: fail2ban
+    state: restarted