Fix windows encoding issue

[dansleboby]

Fix a windows encoding issue:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "\Project\plex2letterboxd\plex2letterboxd\__main__.py", line 4, in <module>
    plex2letterboxd.main()
  File "\plex2letterboxd\plex2letterboxd\plex2letterboxd.py", line 86, in main
    write_csv(sections, args.output, args)
  File "\plex2letterboxd\plex2letterboxd\plex2letterboxd.py", line 67, in write_csv
    writer.writerow([movie.title, movie.year, imdbID, rating, date])
  File "C:\Program Files\Python312\Lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-4: character maps to <undefined>