feat(docker): Use Python 3.14 in docker images

[kiblik]

You Can't Stop Progress.
After #13022, we can go higher

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[github-actions]

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[kiblik]

Tests are failing because of

initializer-1  | Traceback (most recent call last):
initializer-1  |   File "/app/manage.py", line 10, in <module>
initializer-1  |     execute_from_command_line(sys.argv)
initializer-1  |     ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
initializer-1  |   File "/usr/local/lib/python3.14/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
initializer-1  |     utility.execute()
initializer-1  |     ~~~~~~~~~~~~~~~^^
initializer-1  |   File "/usr/local/lib/python3.14/site-packages/django/core/management/__init__.py", line 436, in execute
initializer-1  |     self.fetch_command(subcommand).run_from_argv(self.argv)
initializer-1  |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
initializer-1  |   File "/usr/local/lib/python3.14/site-packages/django/core/management/base.py", line 405, in run_from_argv
initializer-1  |     parser = self.create_parser(argv[0], argv[1])
initializer-1  |   File "/usr/local/lib/python3.14/site-packages/django/core/management/base.py", line 368, in create_parser
initializer-1  |     self.add_arguments(parser)
initializer-1  |     ~~~~~~~~~~~~~~~~~~^^^^^^^^
initializer-1  |   File "/usr/local/lib/python3.14/site-packages/django/core/management/commands/dbshell.py", line 25, in add_arguments
initializer-1  |     parameters = parser.add_argument_group("parameters", prefix_chars="--")
initializer-1  |   File "/usr/local/lib/python3.14/argparse.py", line 1565, in add_argument_group
initializer-1  |     group = _ArgumentGroup(self, *args, **kwargs)
initializer-1  |   File "/usr/local/lib/python3.14/argparse.py", line 1761, in __init__
initializer-1  |     warnings.warn(depr_msg, DeprecationWarning, stacklevel=3)
initializer-1  |     ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
initializer-1  | DeprecationWarning: The use of the undocumented 'prefix_chars' parameter in ArgumentParser.add_argument_group() is deprecated.

The issue was fixed in django/django@0a34112; however, it is available only on 6.x and 5.2.x.
Because

• we are currently on 5.1.x (see details in fix(django): Upgrade to 5.2 #12524) and
• 5.1 is not LTS (5.2 is) and
• it looks like Python 3.14 will be supported since 6.1 (I do not see any positive information about support for 5.2).

I do not see a bright future at this point (we need to wait until other components are ready for this upgrade).

We might suppress the mentioned warning, but more and more issues might be just waiting (if somebody wants to try, feel free).

Let's keep this PR open to keep track of changes in related issues.

[mtesauro]

@kiblik

Yeah, we're in an interesting spot. We've made the change to 3.13 and want to move to 5.2 but are waiting on django-tagulous to get support for 5.2. Once we sort out the tagulous problem, we'll move to 5.2 and can them move to 3.14. There's also the latest version of django-filters which wants 5.2 or later that we're waiting on.

So, interesting times for sure. Thanks for the efforts so far.