paccache.service.in: Restrict all (network) address families

RestrictAddressFamilies used to not have an option to restrict all
address families, but systemd 249 introduced a special value "none"
exactly for this purpose.
Signed-off-by: Frederik “Freso” S. Olesen <freso.dk@gmail.com>

src/paccache.service.in

@@ -28,7 +28,7 @@ ProtectKernelTunables=yes
 ProtectKernelModules=yes
 ProtectKernelLogs=yes
 ProtectControlGroups=yes
-RestrictAddressFamilies=AF_UNIX
+RestrictAddressFamilies=none
 RestrictNamespaces=yes
 LockPersonality=yes
 MemoryDenyWriteExecute=yes