fix: Create the same number of IPv6 egress only gateway routes as the number...

fix: Create the same number of IPv6 egress only gateway routes as the number of NAT gateways that are enabled/created (#1059)

main.tf

@@ -1021,7 +1021,7 @@ resource "aws_egress_only_internet_gateway" "this" {
 }
 
 resource "aws_route" "private_ipv6_egress" {
-  count = local.create_vpc && var.create_egress_only_igw && var.enable_ipv6 ? local.len_private_subnets : 0
+  count = local.create_vpc && var.create_egress_only_igw && var.enable_ipv6 ? local.nat_gateway_count : 0
 
   route_table_id              = element(aws_route_table.private[*].id, count.index)
   destination_ipv6_cidr_block = "::/0"