[easy] fix pre commit error on trunk (vllm-project#26665)

Signed-off-by: Huamin Li <3ericli@gmail.com>
Signed-off-by: 0xrushi <6279035+0xrushi@users.noreply.github.com>

Author: hl475

vllm/model_executor/models/bert.py

@@ -609,8 +609,8 @@ class SPLADESparsePooler(Pooler):
     def __init__(
         self,
         mlm_head: nn.Module,
-        cls_token_id: Optional[int] = 101,
-        sep_token_id: Optional[int] = 102,
+        cls_token_id: int | None = 101,
+        sep_token_id: int | None = 102,
         pooling: str = "max",
         remove_cls_sep: bool = True,
     ):