Update db.migrations.serializer (typeddjango#2421)

Signed-off-by: SaJH <[email protected]>

Author: JaeHyuckSa

django-stubs/db/migrations/serializer.pyi

@@ -1,6 +1,8 @@
 from collections.abc import Callable
 from typing import Any
 
+FUNCTION_TYPES: tuple[type, ...]
+
 class BaseSerializer:
     value: Any
     def __init__(self, value: Any) -> None: ...

scripts/stubtest/allowlist_todo_django51.txt

@@ -190,7 +190,6 @@ django.db.migrations.operations.models.RenameModel.category
 django.db.migrations.operations.special.RunPython.category
 django.db.migrations.operations.special.RunSQL.category
 django.db.migrations.operations.special.SeparateDatabaseAndState.category
-django.db.migrations.serializer.FUNCTION_TYPES
 django.db.models.CharField.slice_expression
 django.db.models.CheckConstraint.__init__
 django.db.models.Field.slice_expression