Update dependency icalendar to v5.0.7

This MR contains the following updates:

Package	Type	Update	Change
icalendar	dependencies	patch	5.0.5 -> 5.0.7

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Release Notes

collective/icalendar

v5.0.7

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Bug fixes:

• to_ical() now accepts RRULE BYDAY values>=10 #​518

v5.0.6

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Minor changes:

• Adjusted duration regex

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