replace @decorated_property decorator

This decorator is no longer necessary as of Mypy
0.981 [1].

In current mypy versions, we require direct use of
`@property` for return types of these methods to be
recognized

[1] https://github.com/python/mypy/issues/1362

Change-Id: Ibc36083dec854c5f9140a9b621e9bf9d5bb4fb61

1 files changed, 0 insertions, 48 deletions

diff --git a/lib/sqlalchemy/util/deprecations.py b/lib/sqlalchemy/util/deprecations.py
index 2322cee60..097150712 100644
--- a/lib/sqlalchemy/util/deprecations.py
+++ b/lib/sqlalchemy/util/deprecations.py
@@ -96,54 +96,6 @@ def deprecated_cls(
     return decorate
 
 
-def deprecated_property(
-    version: str,
-    message: Optional[str] = None,
-    add_deprecation_to_docstring: bool = True,
-    warning: Optional[Type[exc.SADeprecationWarning]] = None,
-    enable_warnings: bool = True,
-) -> Callable[[Callable[..., Any]], property]:
-    """the @deprecated decorator with a @property.
-
-    E.g.::
-
-        class Foo:
-            @deprecated_property("1.4", "thing is deprecated")
-            def thing(self):
-                return "thing"
-
-    is equivalent to::
-
-        class Foo:
-            @property
-            @deprecated("1.4", "thing is deprecated")
-            def thing(self):
-                return "thing"
-
-    How come?
-
-    Because::
-
-        mypy: error: Decorated property not supported
-
-    great!   now it is.
-
-    """
-
-    def decorate(fn: Callable[..., Any]) -> property:
-        return property(
-            deprecated(
-                version,
-                message=message,
-                add_deprecation_to_docstring=add_deprecation_to_docstring,
-                warning=warning,
-                enable_warnings=enable_warnings,
-            )(fn)
-        )
-
-    return decorate
-
-
 def deprecated(
     version: str,
     message: Optional[str] = None,