asyncio.get_event_loop adapt for python 3.14

[Unfold1344]

After upgrading to the latest netbox-docker, python 3.14 is used, which raises a RuntimeError if there is no current event loop upon asyncio.get_event_loop, see: https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.get_event_loop

problem occured when checking diffs for a switch:

{
    "diffs": [],
    "logs": [
        [
            "2026-08-17 11:21:48",
            "info",
            "Working with switch"
        ],
        [
            "2026-08-17 11:21:48",
            "failure",
            "An exception occurred: `RuntimeError: There is no current event loop in thread 'MainThread'.`\n```\nTraceback (most recent call last):\n  File \"/opt/netbox/venv/lib/python3.14/site-packages/netbox_config_diff/jobs.py\", line 22, in collect_diffs\n    configurator.collect_diffs()\n    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^\n  File \"/opt/netbox/venv/lib/python3.14/site-packages/netbox_config_diff/configurator/base.py\", line 107, in collect_diffs\n    loop = asyncio.get_event_loop()\n  File \"/usr/lib/python3.14/asyncio/events.py\", line 715, in get_event_loop\n    raise RuntimeError('There is no current event loop in thread %r.'\n                       % threading.current_thread().name)\nRuntimeError: There is no current event loop in thread 'MainThread'.\n\n```"
        ]
    ]
}