Change normalize_path_middleware redirect from 301 -> 308

aiohttp/web_middlewares.py

@@ -1,7 +1,7 @@
 import re
 from typing import TYPE_CHECKING, Awaitable, Callable, Tuple, Type, TypeVar
 
-from .web_exceptions import HTTPMove, HTTPMovedPermanently
+from .web_exceptions import HTTPMove, HTTPPermanentRedirect
 from .web_request import Request
 from .web_response import StreamResponse
 from .web_urldispatcher import SystemRoute
@@ -42,7 +42,7 @@ def middleware(f: _Func) -> _Func:
 def normalize_path_middleware(
         *, append_slash: bool=True, remove_slash: bool=False,
         merge_slashes: bool=True,
-        redirect_class: Type[HTTPMove]=HTTPMovedPermanently) -> _Middleware:
+        redirect_class: Type[HTTPMove]=HTTPPermanentRedirect) -> _Middleware:
     """
     Middleware factory which produces a middleware that normalizes
     the path of a request. By normalizing it means: