Update main.py

[GannoK]

Fixes UnicodeDecodeError in mirrorselect by decoding with errors='replace'

`❯ mirrorselect -s10 -o

• Using url: https://api.gentoo.org/mirrors/distfiles.xml
• Downloading a list of mirrors...
  Got 240 mirrors.
• Using netselect to choose the top 10 mirrors...Done.
  Traceback (most recent call last):
  File "/usr/lib/python-exec/python3.12/mirrorselect", line 55, in
  MirrorSelect().main(sys.argv)
  File "/usr/lib/python3.12/site-packages/mirrorselect/main.py", line 469, in main
  self.change_config(
  File "/usr/lib/python3.12/site-packages/mirrorselect/main.py", line 107, in change_config
  hosts[i] = hosts[i].decode("utf-8")
  ^^^^^^^^^^^^^^^^^^^^^^^^
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf3 in position 42: invalid continuation byte`

[floppym]

Fixed in a876d13.

[GannoK]

This was my first contribution to the project, too bad it never made it in, but this looks better. Thanks for the update.