Avoid WindowsPath errors for 'qmk format-text'

[zvecr]

Description

qmk format-text /c/Users/treyw/qmk_firmware/keyboards/cloud_macro/readme.md
<class 'TypeError'>
☒ expected string or bytes-like object, got 'WindowsPath'
Traceback (most recent call last):
  File "C:/QMK_MSYS/mingw64/lib/python3.11/site-packages/milc/milc.py", line 604, in call
    return self.call()
           ^^^^^^^^^^^^^^^
  File "C:/QMK_MSYS/mingw64/lib/python3.11/site-packages/milc/milc.py", line 609, in call
    return self._subcommand(self)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "C:/Users/treyw/qmk_firmware/lib/python/qmk/cli/format/text.py", line 57, in format_text
    return dos2unix_run(files)
           ^^^^^^^^^^^^^^^^^^^
  File "C:/Users/treyw/qmk_firmware/lib/python/qmk/cli/format/text.py", line 22, in dos2unix_run
    dos2unix = cli.run(['dos2unix', *chunk])
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:/QMK_MSYS/mingw64/lib/python3.11/site-packages/milc/milc.py", line 168, in run
    safecmd = ' '.join(map(shlex.quote, command))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:/QMK_MSYS/mingw64/lib/python3.11/shlex.py", line 329, in quote
    if _find_unsafe(s) is None:
       ^^^^^^^^^^^^^^^
TypeError: expected string or bytes-like object, got 'WindowsPath'

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).