Update dependency icalendar to v5.0.13

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
icalendar (changelog)	5.0.12 -> 5.0.13

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Release Notes

collective/icalendar (icalendar)

v5.0.13

Compare Source

Minor changes:

• Guide to delete the build folder before running tests
• Add funding information
• Make documentation build with Python 3.12
• Update windows to olson conversion for Greenland Standard Time
• Extend examples in Usage with alarm and recurrence
• Document how to serve the built documentation to view with the browser
• Improve test coverage

New features:

• Create GitHub releases for each tag.

Bug fixes:

• Parse calendars with X-COMMENT properties at the end the file by ignoring these properites

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