Not passing headers when redirected

GitHub is using Azure blob storage which does not expect an authorization header. Need to make sure this header is not being passed on the redirect or the download will fail.

urumanifest/github.py

@@ -176,10 +176,8 @@ def query_result() -> str:
 
     def download_file(self, url: str, hook: Callable[[int, int, int], None] = None, delete: bool = True) -> tempfile.NamedTemporaryFile:
         logging.trace(f"Downloading {url}")
-        headers = dict()
-        if self._token is not None:
-            headers["Authorization"] = f"token {self._token}"
-        req = urllib.request.Request(url, headers=headers)
+        req = urllib.request.Request(url)
+        req.add_unredirected_header("Authorization", f"token {self._token}")
         with closing(urllib.request.urlopen(req)) as res:
             fp = tempfile.NamedTemporaryFile("w+b", delete=delete)
             size, block = 0, 1024 * 8