The deprecate decorator was meant to be called without arguments

This fixes an error as the decorator was initially coded.

src/quart_schema/extension.py

@@ -433,15 +433,11 @@ def decorator(func: Callable) -> Callable:
     return decorator
 
 
-def deprecate() -> Callable:
+def deprecate(func: Callable) -> Callable:
     """Mark endpoint as deprecated."""
+    setattr(func, QUART_SCHEMA_DEPRECATED, True)
 
-    def decorator(func: Callable) -> Callable:
-        setattr(func, QUART_SCHEMA_DEPRECATED, True)
-
-        return func
-
-    return decorator
+    return func
 
 
 def security_scheme(schemes: Iterable[Dict[str, List[str]]]) -> Callable:

tests/test_openapi.py

@@ -74,7 +74,7 @@ async def read_item() -> Tuple[Result, int, Headers]:
     @validate_request(type_)
     @validate_response(Result, 201, Headers)
     @operation_id("make_item")
-    @deprecate()
+    @deprecate
     async def create_item() -> Tuple[Result, int, Headers]:
         return Result(name="bob"), 201, Headers(x_name="jeff")