Update returns_plugin.py

Author: sobolevn

returns/contrib/mypy/returns_plugin.py

@@ -12,7 +12,7 @@
 """
 
 from collections.abc import Callable, Mapping
-from typing import ClassVar, final
+from typing import ClassVar, TypeAlias, final
 
 from mypy.nodes import SymbolTableNode
 from mypy.plugin import (
@@ -39,22 +39,22 @@
 # ============
 
 #: Type for a function hook.
-_FunctionCallback = Callable[[FunctionContext], MypyType]
+_FunctionCallback: TypeAlias = Callable[[FunctionContext], MypyType]
 
 #: Type for a function hook that need a definition node.
-_FunctionDefCallback = Callable[
+_FunctionDefCallback: TypeAlias = Callable[
     [SymbolTableNode | None],
     Callable[[FunctionContext], MypyType],
 ]
 
 #: Type for attribute hook.
-_AttributeCallback = Callable[[AttributeContext], MypyType]
+_AttributeCallback: TypeAlias = Callable[[AttributeContext], MypyType]
 
 #: Type for a method hook.
-_MethodCallback = Callable[[MethodContext], MypyType]
+_MethodCallback: TypeAlias = Callable[[MethodContext], MypyType]
 
 #: Type for a method signature hook.
-_MethodSigCallback = Callable[[MethodSigContext], CallableType]
+_MethodSigCallback: TypeAlias = Callable[[MethodSigContext], CallableType]
 
 
 # Interface