src_path glob patterns do not work from command line flag

[sumpfork]

Running isort --src '*/src/' . results in

Traceback (most recent call last):
  File "/Users/pgorniak/.pyenv/versions/3.8.13/bin/isort", line 8, in <module>
    sys.exit(main())
  File "/Users/pgorniak/.pyenv/versions/3.8.13/lib/python3.8/site-packages/isort/main.py", line 1110, in main
    config = Config(**config_dict)
  File "/Users/pgorniak/.pyenv/versions/3.8.13/lib/python3.8/site-packages/isort/settings.py", line 470, in __init__
    for path in full_paths:
  File "/Users/pgorniak/.pyenv/versions/3.8.13/lib/python3.8/pathlib.py", line 1136, in glob
    drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
  File "/Users/pgorniak/.pyenv/versions/3.8.13/lib/python3.8/pathlib.py", line 75, in parse_parts
    drv, root, rel = self.splitroot(part)
  File "/Users/pgorniak/.pyenv/versions/3.8.13/lib/python3.8/pathlib.py", line 294, in splitroot
    if part and part[0] == sep:
TypeError: 'PosixPath' object is not subscriptable

I think because paths are resolved first using pathlib at https://github.com/PyCQA/isort/blob/main/isort/main.py#L1117.

If run via isort . but with a config file entry like

[settings]
src_paths=*/src/

the pattern works fine because the src_paths entry doesn't exist yet at the line above and is only read from the config file later, meaning it remains a string and the glob works fine.