Update dependency icalendar to v6.2.0

This MR contains the following updates:

Package	Type	Update	Change
icalendar (changelog)	dependencies	minor	6.1.1 -> 6.2.0

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Release Notes

collective/icalendar (icalendar)

v6.2.0

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Minor changes:

• Use ruff to format the source code.
• Update project metadata to use License-Expression.
• Use tzp.localize(dt, None) to remove the timezone from a datetime.
• Remove the HTML documentation when building with tox to force rebuild.
• Switch to PyData Sphinx Theme for documentation. See Issue 803 <https://github.com/collective/icalendar/issues/804>_.

New features:

• Add getters rrules, rdates, and exdates for unified and simple access to these properties. See Issue 662_.
• Add attributes to the calendar for properties NAME, DESCRIPTION, and COLOR. See Issue 655 <https://github.com/collective/icalendar/issues/655>_.
• Add a color attribute to Event, Todo, and Journal components. See Issue 655_.
• Add sequence attribute to Event, Todo, and Journal components. See Issue 802 <https://github.com/collective/icalendar/issues/802>_.
• Add categories attribute to Calendar, Event, Todo, and Journal components. See Issue 655 <https://github.com/collective/icalendar/issues/655>_.
• Add compatibility to :rfc:6868. See Issue 652 <https://github.com/collective/icalendar/issues/652>_.
• Add freebusy property to the Calendar to get this type of subcomponents easier.
• Add parameters from :rfc:5545 to properties ALTREP, CN, CUTYPE, DELEGATED_FROM, DELEGATED_TO, DIR, FBTYPE, LANGUAGE, MEMBER, PARTSTAT, RANGE, RELATED, ROLE, RSVP, SENT_BY, TZID, and RELTYPE. See Issue 798 <https://github.com/collective/icalendar/issues/798>_.
• New properties from :rfc:7986 can occur multiple times in VCALENDAR. See MR 808_.

Bug fixes:

• Fix STANDARD and DAYLIGHT components that have a date as DTSTART. See Issue 218 <https://github.com/collective/icalendar/issues/218>_
• Move import at the end of icalendar.parser into a function to mitigate import errors, see Issue 781 <https://github.com/collective/icalendar/issues/781>_.
• ALTREP, DELEGATED-FROM, DELEGATED-TO, DIR, MEMBER, and SENT-BY require double quotes. These are now always added.
• Classify CATEGORIES as multiple in VEVENT. See MR 808 <https://github.com/collective/icalendar/pull/808>_.

v6.1.3

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Bug fixes:

• Fix to permit TZID forward references to VTIMEZONEs
• Stabelize timezone id lookup, see Issue 780 <https://github.com/collective/icalendar/issues/780>_.

v6.1.2

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Minor changes:

• Add funding link to Tidelift.
• Link to related package.
• Shorten first example in documentation.
• Add name and email properties to vCalAddress.
• Add type hint for property params in icalendar.prop.
• Set default value for params as params={} in mulitple constructors in icalendar.prop to improve usability.
• Improve object initialization performance in icalendar.prop.
• Add type hint for params in multiple constructors in icalendar.prop.

Bug fixes:

• Restrict timezones tested, see Issue 763 <https://github.com/collective/icalendar/issues/763>_

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