chore: add ast-grep rule to convert Optional[T] to T | None (#25560)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/plugin/backwards_invocation/tool.py

@@ -1,5 +1,5 @@
 from collections.abc import Generator
-from typing import Any, Optional
+from typing import Any
 
 from core.callback_handler.workflow_tool_callback_handler import DifyWorkflowCallbackHandler
 from core.plugin.backwards_invocation.base import BaseBackwardsInvocation
@@ -23,7 +23,7 @@ class PluginToolBackwardsInvocation(BaseBackwardsInvocation):
         provider: str,
         tool_name: str,
         tool_parameters: dict[str, Any],
-        credential_id: Optional[str] = None,
+        credential_id: str | None = None,
     ) -> Generator[ToolInvokeMessage, None, None]:
         """
         invoke tool