On github errors, retry once, and return a result or an exception

This commit is meant to fix point 5. on analysis at https://gist.github.com/majamassarini/85033b59607a3f3da570cf5aaf2b8c7a

raise_on_status (in urllib3.Retry) meaning is:
Similar meaning to raise_on_redirect: whether we should raise an exception, or return a response, if status falls in status_forcelist range and retries have been exhausted.

I would force to have or a result or an exception for not making Celery task hanging.

ogr/services/github/service.py

@@ -49,7 +49,7 @@ def __init__(
         github_app_private_key_path: Optional[str] = None,
         tokman_instance_url: Optional[str] = None,
         github_authentication: GithubAuthentication = None,
-        max_retries: Union[int, Retry] = 0,
+        max_retries: Union[int, Retry] = 1,
         **kwargs,
     ):
         """
@@ -69,12 +69,11 @@ def __init__(
         else:
             self._max_retries = Retry(
                 total=int(max_retries),
-                read=0,
                 # Retry mechanism active for these HTTP methods:
                 allowed_methods=["DELETE", "GET", "PATCH", "POST", "PUT"],
                 # Only retry on following HTTP status codes
                 status_forcelist=[500, 503, 403, 401],
-                raise_on_status=False,
+                raise_on_status=True,
             )
 
         if not self._default_auth_method: