defiant: update to nixos 26.05

hosts/defiant/services/wireguard.nix

@@ -16,10 +16,10 @@ in {
       privateKeyFile = "/etc/wireguard/defiant.private";
 
       postSetup = ''
-        ${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -s 10.100.0.0/24 -d 192.168.10.0/24 -o eth0 -j MASQUERADE
+        ${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -s 10.100.0.0/24 -d 192.168.10.0/24 -o enp3s0 -j MASQUERADE
       '';
       postShutdown = ''
-        ${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -s 10.100.0.0/24 -d 192.168.10.0/24 -o eth0 -j MASQUERADE
+        ${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -s 10.100.0.0/24 -d 192.168.10.0/24 -o enp3s0 -j MASQUERADE
       '';
 
       peers = (import ../../../common/wireguard-peers.nix);