host_vars: update memcached_socket variables

This is needed for prometheus memcached exporter to work.

(AUR doesn't seem to use memcached anymore, but changed it for
consistency.)

host_vars/aur-dev.archlinux.org/misc

 ---
 filesystem: btrfs
-memcached_socket: "/var/run/aurweb.sock"
+memcached_socket: "/run/memcached/aurweb.sock"
 wireguard_address: 10.0.0.3
 wireguard_public_key: E4wLmumdWE1oVjWxPL5FU+BiuPxPdJa6K0wLZVlC0ys=

host_vars/aur.archlinux.org/misc

 ---
 filesystem: btrfs
-memcached_socket: "/var/run/aurweb.sock"
+memcached_socket: "/run/memcached/aurweb.sock"
 wireguard_address: 10.0.0.2
 wireguard_public_key: TPLeGQ7qU6ZNtcgDbEV0SSYScvK+XS5igcPdGSXo6UA=

host_vars/patchwork.archlinux.org/misc

 ---
 filesystem: btrfs
-memcached_socket: "/var/run/patchwork.sock"
+memcached_socket: "/run/memcached/patchwork.sock"
 fetchmail_user: "patchwork@archlinux.org"
 fetchmail_delivery_cmd: "/usr/local/bin/patchwork-parsemail-wrapper.sh"
 

host_vars/wiki.archlinux.org/misc

 ---
 filesystem: btrfs
-memcached_socket: "/var/run/archwiki.sock"
+memcached_socket: "/run/memcached/archwiki.sock"
 
 fail2ban_jails:
   sshd: true