Update returns_plugin.py (#2088)

* Update returns_plugin.py

* Update returns_plugin.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: sobolevn

returns/contrib/mypy/returns_plugin.py

@@ -12,9 +12,8 @@
 """
 
 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 (
     AttributeContext,
     FunctionContext,
@@ -39,22 +38,16 @@
 # ============
 
 #: Type for a function hook.
-_FunctionCallback = Callable[[FunctionContext], MypyType]
-
-#: Type for a function hook that need a definition node.
-_FunctionDefCallback = Callable[
-    [SymbolTableNode | None],
-    Callable[[FunctionContext], MypyType],
-]
+_FunctionCallback: TypeAlias = 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