Fix stdlib test for copy.replace

Author: decorator-factory

stdlib/@tests/test_cases/check_copy.py

@@ -10,7 +10,7 @@ class ReplaceableClass:
     def __init__(self, val: int) -> None:
         self.val = val
 
-    def __replace__(self, val: int) -> Self:
+    def __replace__(self, /, *, val: int) -> Self:
         cpy = copy.copy(self)
         cpy.val = val
         return cpy
@@ -29,11 +29,11 @@ class Box(Generic[_T_co]):
     def __init__(self, value: _T_co, /) -> None:
         self.value = value
 
-    def __replace__(self, value: str) -> Box[str]:
+    def __replace__(self, /, *, value: str) -> Box[str]:
         return Box(value)
 
 
 if sys.version_info >= (3, 13):
     box1: Box[int] = Box(42)
-    box2 = copy.replace(box1, val="spam")
+    box2 = copy.replace(box1, value="spam")
     assert_type(box2, Box[str])