Fix std.net.StreamServer.Connection ref

src/http/conn.zig

@@ -9,7 +9,7 @@ pub const Connection = struct {
     address: std.net.Address,
     stream: std.net.Stream,
 
-    fn new(id: Id, std_conn: std.net.Connection) Connection {
+    fn new(id: Id, std_conn: std.net.StreamServer.Connection) Connection {
         std.log.debug("new connection conn_id={}", .{id});
         return .{
             .id = id,