chore(deps): update dependency icalendar to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
icalendar (changelog)	~=5.0 -> ~=6.0

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Release Notes

collective/icalendar (icalendar)

### [`v6.0.0`](https://redirect.github.com/collective/icalendar/blob/HEAD/CHANGES.rst#600-2024-09-28) [Compare Source](https://redirect.github.com/collective/icalendar/compare/v5.0.13...v6.0.0) Minor changes: - Add `__all__` variable to each modules in `icalendar` package - Improve test coverage. - Adapt `test_with_doctest.py` to correctly run on Windows. - Measure branch coverage when running tests. - Export `Component` base class for typing New features: - Use `pyproject.toml` file instead of `setup.py` Bug fixes: - Fix link to stable release of tox in documentation. - Fix a bad `bytes` replace in `unescape_char`. - Handle `ValueError` in `vBinary.from_ical`. - Ignore the BOM character in incorrectly encoded ics files.

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Configuration

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