`FileNotFoundError` when running Zehef outside the project directory (missing `config.json` path resolution)

[ShutdownRepo]

When running Zehef from outside its directory (e.g., using an absolute path), the program crashes because it cannot locate config.json.
The path to the config file appears to be resolved relative to the current working directory rather than the script’s location.

Tool was installed in a venv and is called with the following command : /opt/tools/Zehef/venv/bin/python3 /opt/tools/Zehef/zehef.py -h

Traceback (most recent call last):
  File "/opt/tools/Zehef/zehef.py", line 5, in <module>
    from main import main; asyncio.run(main())
                           ^^^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.11.13/lib/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.11.13/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.11.13/lib/python3.11/asyncio/base_events.py", line 654, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/opt/tools/Zehef/main.py", line 10, in main
    await parser()
  File "/opt/tools/Zehef/lib/cli.py", line 10, in parser
    await Version_Checker.checker()
  File "/opt/tools/Zehef/lib/update.py", line 7, in checker
    with open('config.json', "+r", encoding='utf-8') as file:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: 'config.json'