[Bug]: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3

[Gamewalker]

I Have A Problem With:

A specific source, The integration in general

What's Your Problem

Hello,

ICS looks like:

BEGIN:VEVENT
UID:papiertonne-2025-03-18
DTSTART:20250318
DTEND:20250318
DTSTAMP:20250128T115820
SUMMARY:Papiertonne
SEQUENCE:0
STATUS:CONFIRMED
CREATED:20250128T115820
ORGANIZER:StadtWerke Rösrath
TRANSP:TRANSPARENT
X-MICROSOFT-CDO-BUSYSTATUS:FREE
END:VEVENT

I think the "ö" in "ORGANIZER:StadtWerke Rösrath" is the problem, any advice how to fix it?

Source (if relevant)

https://www.stadtwerke-roesrath.de/wp-admin/admin-ajax.php?action=swr_download_ics&street=hahnenberg&bins%5B%5D=&bins%5B%5D=26089&bins%5B%5D=26088&bins%5B%5D=26087&bins%5B%5D=26086&date=Tue+Jan+28+2025+13%3A57%3A21+GMT%2B0100+%28Mitteleurop%C3%A4ische+Normalzeit%29

Logs

2025-01-28 13:40:58.534 ERROR (SyncWorker_2) [custom_components.waste_collection_schedule.waste_collection_schedule.source_shell] fetch failed for source ICS:
Traceback (most recent call last):
  File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source_shell.py", line 158, in fetch
    entries: Iterable[Collection] = self._source.fetch()
                                    ~~~~~~~~~~~~~~~~~~^^
  File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source/ics.py", line 207, in fetch
    return self.fetch_url(self._url, self._params)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source/ics.py", line 235, in fetch_url
    return self._convert(r.text)
           ~~~~~~~~~~~~~^^^^^^^^
  File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source/ics.py", line 250, in _convert
    dates = self._ics.convert(data)
  File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/service/ICS.py", line 49, in convert
    start=start_date, end=end_date, string_content=ics_data.encode("utf-8").decode("ascii")
                                                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 308: ordinal not in range(128)

Relevant Configuration

waste_collection_schedule:
  sources:
    - name: ics
      calendar_title: Rösrath (Hahnenberg)
      args:
        url: https://www.stadtwerke-roesrath.de/wp-admin/admin-ajax.php?action=swr_download_ics&street=hahnenberg&bins%5B%5D=&bins%5B%5D=26089&bins%5B%5D=26088&bins%5B%5D=26087&bins%5B%5D=26086&date=Tue+Jan+28+2025+13%3A57%3A21+GMT%2B0100+%28Mitteleurop%C3%A4ische+Normalzeit%29

Checklist Source Error

• Use the example parameters for your source (often available in the documentation) (don't forget to restart Home Assistant after changing the configuration)
• Checked that the website of your service provider is still working
• Tested my attributes on the service provider website (if possible)
• I have tested with the latest version of the integration (master) (for HACS in the 3 dot menu of the integration click on "Redownload" and choose master as version)

Checklist Sensor Error

• Checked in the Home Assistant Calendar tab if the event names match the types names (if types argument is used)

Required

• I have searched past (closed AND opened) issues to see if this bug has already been reported, and it hasn't been.
• I understand that people give their precious time for free, and thus I've done my very best to make this problem as easy as possible to investigate.