Werk #15891: ical_import: .ical files are now imported using the icalendar package

Component	Setup
Title	ical_import: .ical files are now imported using the icalendar package
Date	Jun 16, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

When importing .ical files, the icalendar package is now responsible for parsing the contents.

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