Python 3.12 compatibility: Bump fabric

[systemofapwne]

Trying to run linien on python 3.12 fails due to an import error

raceback (most recent call last):
  File "/home/gardener/.local/bin/linien", line 5, in <module>
    from linien_gui.app import main
  File "/home/gardener/.local/lib/python3.12/site-packages/linien_gui/app.py", line 23, in <module>
    from linien_client.connection import LinienClient
  File "/home/gardener/.local/lib/python3.12/site-packages/linien_client/connection.py", line 29, in <module>
    from .deploy import hash_username_and_password, start_remote_server
  File "/home/gardener/.local/lib/python3.12/site-packages/linien_client/deploy.py", line 24, in <module>
    from fabric import Connection
  File "/home/gardener/.local/lib/python3.12/site-packages/fabric/__init__.py", line 3, in <module>
    from .connection import Config, Connection
  File "/home/gardener/.local/lib/python3.12/site-packages/fabric/connection.py", line 14, in <module>
    from invoke import Context
  File "/home/gardener/.local/lib/python3.12/site-packages/invoke/__init__.py", line 23, in <module>
    from .loader import FilesystemLoader  # noqa
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/gardener/.local/lib/python3.12/site-packages/invoke/loader.py", line 3, in <module>
    import imp
ModuleNotFoundError: No module named 'imp'

The package imp is considered deprecated since python 3.6 and seems to have been dropped with python 3.12. Since the used version of fabric is kind of outdated and still relies on older versions of invoke which in turn uses imp, linien will not run on python 3.12 onwords.

Solution: Bump linien to use recent fabric package. This however needs some code refactoring, since there are breaking changes between fabric 2.7.1 to 3+.

[bleykauf]

Thanks for reporting this. Luckily no changes to the code were necessary for us, no breaking changes that affect Linien.

Fixed in new release.