Services/avahi: rename moved option

roles/common/services/avahi.nix

@@ -1,8 +1,19 @@
 { config, ... }:
-
+let
-{
+	old = {
-	services.avahi = {
-		enable = true;
 		nssmdns = true;
 	};
+	new = {
+		nssmdns4 = true;
+	};
+in
+{
+	/*
+		NixOS 24.05 changed the option for mnds to be able to turn on/off IPv6
+		23.11 doesn't support this, so I need to use the conditional to be able to
+		use the same config for both
+	*/
+	services.avahi = {
+		enable = true;
+	} // (if config.system.nixos.release == "23.11" then old else new);
 }