Update yamllint to fix dependency issue

I think this still validates everything we need it to

ansible/roles/gateway/tasks/wireguard.yml

@@ -3,7 +3,7 @@
     src: files/wireguard-server.conf
     dest: /etc/wireguard/wg0.conf
     mode: "0600"
-    backup: yes
+    backup: true
   become: true
   register: wireguard_conf
 
@@ -41,9 +41,9 @@
   sysctl:
     name: net.ipv4.ip_forward
     value: "1"
-    sysctl_set: yes
+    sysctl_set: true
     state: present
-    reload: yes
+    reload: true
     sysctl_file: /etc/sysctl.d/99-sysctl.conf
   become: true