fix deprecation issues in apu config

apu/configuration.nix

@@ -63,7 +63,7 @@ let
     Address=${address}
   '';
 
-  buildBridgeVLANConfig = id: { bridgeVLANConfig.VLAN = id; };
+  buildBridgeVLANConfig = id: { VLAN = id; };
 
   buildVlanNetwork = name: { id, ipv6 ? false, staticLeases ? [ ], ... }: {
     name = "30-${name}";
@@ -118,6 +118,8 @@ in
 
   systemd.network = {
     enable = true;
+    config.networkConfig.IPv6Forwarding = true;
+
     links = {
       "10-extern0" = {
         matchConfig.Path = "pci-0000:01:00.0";
@@ -178,7 +180,7 @@ in
           DHCP = true;
           DNS = "127.0.0.1";
           IPv6AcceptRA = true;
-          IPForward = true;
+          IPv4Forwarding = true;
         };
         dhcpV6Config = {
           PrefixDelegationHint = "::/56";