Update AlbertModel type annotation (#24450)

Update type annotation

src/transformers/models/albert/modeling_albert.py

@@ -687,9 +687,9 @@ class AlbertModel(AlbertPreTrainedModel):
         position_ids: Optional[torch.LongTensor] = None,
         head_mask: Optional[torch.FloatTensor] = None,
         inputs_embeds: Optional[torch.FloatTensor] = None,
-        output_attentions: Optional[None] = None,
-        output_hidden_states: Optional[None] = None,
-        return_dict: Optional[None] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
     ) -> Union[BaseModelOutputWithPooling, Tuple]:
         output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
         output_hidden_states = (