[deps] goodbye python 3.9 (#9677)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: hiyouga <16256802+hiyouga@users.noreply.github.com>
Co-authored-by: hiyouga <hiyouga@buaa.edu.cn>

src/llamafactory/v1/utils/plugin.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 
-from typing import Callable, Optional
+from collections.abc import Callable
 
 from . import logging
 
@@ -29,7 +29,7 @@ class BasePlugin:
 
     _registry: dict[str, Callable] = {}
 
-    def __init__(self, name: Optional[str] = None):
+    def __init__(self, name: str | None = None):
         """Initialize the plugin with a name.
 
         Args: