"pipreqs --encoding=utf8 --force ." return error

Hi, when I do this command : ``pipreqs --encoding=utf8 --force .`` I have this error : `` 'utf-8' codec can't decode byte 0xf6 in position 122: invalid start byte``.
I tried without the encoding, and I have the charmap error. i tried with utf16, other error. Do you know why ?

Reproduce `pipreqs --encoding=utf8 --force .` in a project containing the reported non-UTF-8 input, then trace the encoding handling used while scanning files. Check existing tests and documentation for encoding behavior; the expected fix should make the command handle this input consistently or report a clear, actionable error.

Written by the indexing model from the issue text.