Fix #4448 : Update Python version in dev to 3.9.21

[Zahed-Riyaz]

This is to fix issue #4448.

Previously the Docker images for development of EvalAI relied on Python 3.7.5, this PR updates them to use Python 3.9.21.

[Zahed-Riyaz]

Hi @RishabhJain2018 It seems the travis.yml file uses python 3.7.5 and the checks are failing because it's trying to build with that on an docker image that uses python 3.9.21. Do I need to change the travis.yml file as well to use python 3.9.21? Please guide me

[RishabhJain2018]

Sure, let's update the travis.yml too!

[Zahed-Riyaz]

@RishabhJain2018 seems like Travis CI is unable to build Django. Not sure why this is happening

 �[91mERROR: Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/cli/base_command.py", line 160, in exc_logging_wrapper
    status = run_func(*args)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/cli/req_command.py", line 247, in wrapper
    return func(self, options, args)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/commands/install.py", line 419, in run
    requirement_set = resolver.resolve(
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 92, in resolve
    result = self._result = resolver.resolve(
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/resolvelib/resolvers.py", line 481, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/resolvelib/resolvers.py", line 348, in resolve
    self._add_to_criteria(self.state.criteria, r, parent=None)
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/resolvelib/resolvers.py", line 172, in _add_to_criteria
    if not criterion.candidates:
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/resolvelib/structs.py", line 151, in __bool__
    return bool(self._sequence)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 155, in __bool__
    return any(self)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 143, in <genexpr>
    return (c for c in iterator if id(c) not in self._incompatible_ids)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/found_candidates.py", line 47, in _iter_built
    candidate = func()
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/factory.py", line 206, in _make_candidate_from_link
    self._link_candidate_cache[link] = LinkCandidate(
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 297, in __init__
    super().__init__(
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 162, in __init__
    self.dist = self._prepare()
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 231, in _prepare
    dist = self._prepare_distribution()
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 308, in _prepare_distribution
    return preparer.prepare_linked_requirement(self._ireq, parallel_builds=True)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 491, in prepare_linked_requirement
    return self._prepare_linked_requirement(req, parallel_builds)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 536, in _prepare_linked_requirement
    local_file = unpack_url(
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 166, in unpack_url
    file = get_http_url(
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 107, in get_http_url
    from_path, content_type = download(link, temp_dir.path)
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/network/download.py", line 147, in __call__
    for chunk in chunks:
  File "/usr/local/lib/python3.9/site-packages/pip/_internal/cli/progress_bars.py", line 52, in _rich_progress_bar
    with progress:
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/rich/progress.py", line 1169, in __enter__
    self.start()
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/rich/progress.py", line 1160, in start
    self.live.start(refresh=True)
  File "/usr/local/lib/python3.9/site-packages/pip/_vendor/rich/live.py", line 132, in start
    self._refresh_thread.start()
  File "/usr/local/lib/python3.9/threading.py", line 899, in start
    _start_new_thread(self._bootstrap, ())
RuntimeError: can't start new thread
�[0m�[91m
[notice] A new release of pip is available: 23.0.1 -> 25.0.1
[notice] To update, run: pip install --upgrade pip
�[0mThe command '/bin/sh -c pip install -r dev.txt' returned a non-zero code: 2
�[31mERROR�[0m: Service 'django' failed to build : Build failed

[Zahed-Riyaz]

Ah, it looks like there's an incompatibility issue between python:3.9.21 and django:2.2.20 on a certain level.

Hopefully finding a conflict free version for django will resolve that :)

[Zahed-Riyaz]

After further iterating with multiple library and python versions it seems to converge to the following error : django.contrib.admin.sites.NotRegistered: The model Token is not registered.

It seems the token is not registering prior to being unregistered in admin.py