Update dependency icalendar to v5.0.11

This MR contains the following updates:

Package	Type	Update	Change
icalendar	dependencies	patch	5.0.7 -> 5.0.11

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Release Notes

collective/icalendar (icalendar)

v5.0.11

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Minor changes:

• The cli utility now displays start and end datetimes in the user's local timezone. Ref: #​561 [vimpostor]

New features:

• Added fuzzing harnesses, for integration to OSSFuzz.
• icalendar releases are deployed to Github releases Fixes: #​563 [jacadzaca]

Bug fixes:

• CATEGORIES field now accepts a string as argument Ref: #​322 [jacadzaca]
• Multivalue FREEBUSY property is now parsed properly Ref: #​27 [jacadzaca]
• Compare equality and inequality of calendars more completely Ref: #​570
• Use non legacy timezone name. Ref: #​567
• Add some compare functions. Ref: #​568
• Change OSS Fuzz build script to point to harnesses in fuzzing directory Ref: #​574

v5.0.10

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Bug fixes:

• Component._encode stops ignoring parameters argument on native values, now merges them Fixes: #​557 [zocker1999net]

v5.0.9

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Bug fixes:

• PERIOD values now set the timezone of their start and end. #​556

v5.0.8

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Minor changes:

• Update build configuration to build readthedocs. #​538
• No longer run the plone.app.event tests.
• Add documentation on how to parse .ics files. #​152
• Move pip caching into Python setup action.
• Check that issue #​165 can be closed.
• Updated about.rst for issue #​527
• Avoid vText.__repr__ BytesWarning.

Bug fixes:

• Calendar components are now properly compared Ref: #​550 Fixes: #​526 [jacadzaca]

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