py/objint: Make byteorder argument optional in int.to_bytes() method.

This was made optional in CPython 3.11.
Signed-off-by: Amirreza Hamzavi <amirrezahamzavi2000@gmail.com>

py/objint.c

@@ -422,14 +422,13 @@ static MP_DEFINE_CONST_CLASSMETHOD_OBJ(int_from_bytes_obj, MP_ROM_PTR(&int_from_
 
 static mp_obj_t int_to_bytes(size_t n_args, const mp_obj_t *args) {
     // TODO: Support signed (currently behaves as if signed=(val < 0))
-    (void)n_args;
     bool overflow;
 
     mp_int_t dlen = mp_obj_get_int(args[1]);
     if (dlen < 0) {
         mp_raise_ValueError(NULL);
     }
-    bool big_endian = args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little);
+    bool big_endian = n_args < 3 || args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little);
 
     vstr_t vstr;
     vstr_init_len(&vstr, dlen);
@@ -469,7 +468,7 @@ static mp_obj_t int_to_bytes(size_t n_args, const mp_obj_t *args) {
 
     return mp_obj_new_bytes_from_vstr(&vstr);
 }
-static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_to_bytes_obj, 3, 4, int_to_bytes);
+static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_to_bytes_obj, 2, 4, int_to_bytes);
 
 static const mp_rom_map_elem_t int_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_from_bytes), MP_ROM_PTR(&int_from_bytes_obj) },