Update dependency icalendar to v7.2.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
icalendar (changelog)	==7.2.0 → ==7.2.2

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Release Notes

collective/icalendar (icalendar)

v7.2.2

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Documentation

- Fixed duplicate ``vInt.min`` and ``vInt.max`` descriptions in the API reference that caused the Read the Docs build to fail.

7.2.1 (2026-07-20)
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Security fixes

• Fixed GHSA-qjcq-q7h7-r74v <https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v>_: a crafted REPEAT on a VALARM could exhaust memory or CPU via :attr:Alarm.triggers <icalendar.cal.alarm.Alarm.triggers> and :class:~icalendar.alarms.Alarms. Expansion is now capped at icalendar.config.MAX_ALARM_REPEAT. Its default is 10000. Set to -1 to disable the cap. :class:~icalendar.prop.integer.vInt now also enforces the :rfc:5545 signed 32-bit integer range on parse. @​SashankBhamidi

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