fix: Use Any for HttpResponse content argument

Django can handle anything here, that can be converted to string.

django-stubs/http/response.pyi

@@ -78,7 +78,7 @@ class HttpResponse(HttpResponseBase, Iterable[bytes]):
     test_was_secure_request: bool
     xframe_options_exempt: bool
     streaming: bool
-    def __init__(self, content: bytes = ..., *args: Any, **kwargs: Any) -> None: ...
+    def __init__(self, content: Any = ..., *args: Any, **kwargs: Any) -> None: ...
     def serialize(self) -> bytes: ...
     @property
     def content(self) -> bytes: ...