[BUG] icalendar generates UTC timezone

[niccokunzmann]

Describe the bug

icalendar should not generate UTC timezone information.

To reproduce

    >>> from icalendar import Calendar, Event
    >>> from datetime import datetime
    >>> from zoneinfo import ZoneInfo
    >>> event = Event.new(
    ...     summary="Meeting in Zurich",
    ...     start=datetime(2022, 1, 1, 12, 0, 0, tzinfo=ZoneInfo("Europe/Zurich")),
    ...     end=datetime(2022, 1, 1, 13, 0, 0, tzinfo=ZoneInfo("Europe/Zurich")),
    ...     location="Zurich, Switzerland",
    ... )
    >>> calendar = Calendar.new(
    ...     subcomponents=[event],    
    ... )
    >>> calendar.add_missing_timezones()
    >>> calendar.timezones[0].tz_name
    "UTC"
    >>> calendar.timezones[1].tz_name
    'Europe/Zurich'

Expected behavior

UTC should not be generated.

Environment

• Operating system: Xubuntu 24
• Python version: 3.14
• icalendar version: main@52b5142a160b94b411ad42183f2396daae2f0bc0 7.0.0a4.dev441

Additional context

• I tested it with the latest version. For example, I used the command pip3 install --upgrade https://github.com/collective/icalendar.git.
• I attached the .ics sample file, or there is no .ics sample file.

[Eshaan-byte]

Hi @niccokunzmann I want to work on this issue? Thank you!