Upgrade icalendar to version 2.8.0
What does this MR do and why?
This will upgrade icalendar gem to version 2.8.0, for ruby 3 support (https://github.com/icalendar/icalendar/actions/runs/2646761045/jobs/4109728008).
changes: https://my.diffend.io/gems/icalendar/2.4.1/2.8.0
changelog: https://github.com/icalendar/icalendar/blob/main/History.txt
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Related to #378164 (closed)