Fints needs updates to collection modules for python >v3.9 (ImportError: cannot import name 'Iterable' from 'collections')

[Nixbligger]

Hi,
I am facing an issue after adding the byro-fints plugin to my (almost) running docker installation:

┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ ┏━o━━━━o━━━┓ This is byro v0.0.2 calling, running in production mode.   ┃
┃ ┣━━━o━━━o━━┫                                                            ┃
┃ ┣━━━━━━━━━━┫ Settings:                                                  ┃
┃ ┃   byro   ┃ Read from: byro.cfg                                        ┃
┃ ┗━━━━━━━━━━┛ Logging:   /var/byro/data/logs                             ┃
┃              Plugins:   byro_fints,byro_gemeinnuetzigkeit               ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/local/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/byro/byro/__main__.py", line 9, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 395, in execute
    django.setup()
  File "/usr/local/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python3.10/site-packages/django/apps/registry.py", line 122, in populate
    app_config.ready()
  File "/byro/local/byro-fints/byro_fints/__init__.py", line 18, in ready
    from . import urls  # NOQA
  File "/byro/local/byro-fints/byro_fints/urls.py", line 3, in <module>
    from . import views
  File "/byro/local/byro-fints/byro_fints/views.py", line 21, in <module>
    from fints.client import FinTS3PinTanClient, FinTSOperations, NeedTANResponse, TransactionResponse, ResponseStatus, FinTSClientMode
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/client.py", line 14, in <module>
    from .connection import FinTSHTTPSConnection
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/connection.py", line 9, in <module>
    from .message import FinTSInstituteMessage, FinTSMessage
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/message.py", line 3, in <module>
    from .formals import SegmentSequence
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/formals.py", line 3, in <module>
    from fints.fields import *
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/fields.py", line 6, in <module>
    from fints.types import Container, SegmentSequence, TypedField
  File "/usr/local/lib/python3.10/site-packages/fints-3.0.1-py3.10.egg/fints/types.py", line 1, in <module>
    from collections import Iterable, OrderedDict
ImportError: cannot import name 'Iterable' from 'collections' (/usr/local/lib/python3.10/collections/__init__.py)

As you can see from the info box, I had previously installed the gemeinnuetzigkeit plugin and the installation went well, and byro was working when fired up again.

I did some googling, and it seems, it merely requires a few code lines to fix this issue. According to this related issue comment on Azure, it might take only this few lines:

try:
    # Python <= 3.9
    from collections import Iterable
except ImportError:
    # Python > 3.9
    from collections.abc import Iterable

to be added to /fints/types.py to fix that. Unfortunately, I wasn't able to test it properly, because I didn't manage to get into the django "manage" container. I am not much a programmer, so I wouldn't know how to do this myself. Any chance one more capable than me could take over?