service dies with out-of-date gpstime package

I started a rolling restart of gracedb-playground and when it came back online, it 503'ed with the following error:

Traceback (most recent call last):
  File "/app/gracedb_project/manage.py", line 44, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.9/dist-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.9/dist-packages/django/core/management/__init__.py", line 395, in execute
    django.setup()
  File "/usr/local/lib/python3.9/dist-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python3.9/dist-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/usr/local/lib/python3.9/dist-packages/django/apps/config.py", line 301, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/app/gracedb_project/gracedb/alerts/models.py", line 19, in <module>
    from .phone import get_twilio_from
  File "/app/gracedb_project/gracedb/alerts/phone.py", line 12, in <module>
    from events.permission_utils import is_external
  File "/app/gracedb_project/gracedb/events/permission_utils.py", line 9, in <module>
    from .models import Event
  File "/app/gracedb_project/gracedb/events/models.py", line 31, in <module>
    from gpstime import gpstime
  File "/usr/local/lib/python3.9/dist-packages/gpstime/__init__.py", line 41, in <module>
    from .leaps import LEAPDATA
  File "/usr/local/lib/python3.9/dist-packages/gpstime/leaps.py", line 187, in <module>
    LEAPDATA = LeapData()
  File "/usr/local/lib/python3.9/dist-packages/gpstime/leaps.py", line 126, in __init__
    self._load(fetch_ietf_leapfile, LEAPFILE_IETF_URL)
  File "/usr/local/lib/python3.9/dist-packages/gpstime/leaps.py", line 136, in _load
    raise RuntimeError(f"Error loading leap file {path}: {str(e)}")
RuntimeError: Error loading leap file https://www.ietf.org/timezones/data/leap-seconds.list: 404 Client Error: Not Found for url: https://www.ietf.org/timezones/data/leap-seconds.list

uhhhh does it not seem dangerous to anyone else to depend on an external file like that which just breaks the package.

I brought playground down to one container, and manually upgraded gpstime (from 0.6.2) to the latest version (0.8.1, https://git.ligo.org/computing/sccb/-/issues/1397) and that fixed it.

What this means is that production is waiting to break if it restarts for any reason. I'm going to upgrade gpstime, build new containers and redeploy while the detectors are offline.