fix stubs of HttpRequest read / readine

these both accept None which consumes the whole stream

Author: asottile

django-stubs/http/request.pyi

@@ -105,8 +105,8 @@ class HttpRequest:
     def accepts(self, media_type: str) -> bool: ...
     def close(self) -> None: ...
     # File-like and iterator interface, a minimal subset of BytesIO.
-    def read(self, n: int = -1, /) -> bytes: ...
-    def readline(self, limit: int = -1, /) -> bytes: ...
+    def read(self, n: int | None = -1, /) -> bytes: ...
+    def readline(self, limit: int | None = -1, /) -> bytes: ...
     def __iter__(self) -> Iterator[bytes]: ...
     def readlines(self) -> list[bytes]: ...