Update dependency icalendar to v5.0.5

This MR contains the following updates:

Package	Type	Update	Change
icalendar	dependencies	patch	5.0.4 -> 5.0.5

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Release Notes

collective/icalendar

v5.0.5

Compare Source

Minor changes:

• Added support for BYWEEKDAY in vRecur ref: #​268

Bug fixes:

• Fix problem with ORGANIZER in FREE/BUSY #​348

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