Connection aborted in google/oauth2 affecting firebase

Start in google/oauth2/_client.py at _token_endpoint_request_no_throw and _perform_request, using the firebase_admin/messaging.py call path in the traceback to understand the failure. Reproduce the token refresh failure and inspect the retryable-error handling; done means Connection aborted is covered by the retry behavior and the relevant test passes.

Connection aborted didn't included in retryable list and any firebase API calls fails frequently.

Traceback (most recent call last):
  File "/usr/src/app/notifications/services/notification_service/providers/mobile.py", line 94, in _send_notification
    firebase.send(fb_message, app=firebase_app)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/messaging.py", line 121, in send
    return _get_messaging_service(app).send(message, dry_run)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/messaging.py", line 411, in send
    resp = self._client.body(
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/_http_client.py", line 131, in body
    resp = self.request(method, url, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/_http_client.py", line 118, in request
    resp = self._session.request(method, self.base_url + url, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/google/auth/transport/requests.py", line 577, in request
    self.credentials.refresh(auth_request)
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/service_account.py", line 445, in refresh
    access_token, expiry, _ = _client.jwt_grant(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 308, in jwt_grant
    response_data = _token_endpoint_request(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 268, in _token_endpoint_request
    response_status_ok, response_data, retryable_error = _token_endpoint_request_no_throw(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 215, in _token_endpoint_request_no_throw
    request_succeeded, response_data, retryable_error = _perform_request()
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 191, in _perform_request
    response = request(
  File "/usr/local/lib/python3.10/site-packages/google/auth/transport/requests.py", line 192, in __call__
    raise new_exc from caught_exc
google.auth.exceptions.TransportError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))