[FIX] sale_triple_discount: Remove call to deprecated

Method 'invalidate_cache' is deprecated. To invalidate specific field's value into the cache for a recordset we must use the 'invalidate_recordset' method on the recordset itself.

sale_triple_discount/models/sale_order_line.py

@@ -102,7 +102,7 @@ def triple_discount_preprocess(self):
  this method is called multiple times.
  Updating the cache provides consistency through re-computations."""
  prev_values = dict()
- self.invalidate_cache(fnames=self._discount_fields(), ids=self.ids)
+ self.invalidate_recordset(self._discount_fields())
  for line in self:
  prev_values[line] = {
  fname: line[fname] for fname in self._discount_fields()
@@ -118,10 +118,7 @@ def triple_discount_preprocess(self):
  def triple_discount_postprocess(self, prev_values):
  """Restore the discounts of the lines in the dictionary prev_values.
  Updating the cache provides consistency through re-computations."""
- self.invalidate_cache(
- fnames=self._discount_fields(),
- ids=[line.id for line in list(prev_values.keys())],
- )
+ self.invalidate_recordset(self._discount_fields())
  for line, prev_vals_dict in list(prev_values.items()):
  line.update(prev_vals_dict)