chore(deps): update dependency caldav to v1.3.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
caldav	==1.3.6 -> ==1.3.9

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Release Notes

python-caldav/caldav (caldav)

v1.3.9

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Some bugfixes.

Fixed

• Some parts of the library would throw OverflowError on very weird dates/timestamps. Now those are converted to the minimum or maximum accepted date/timestamp. Credits to github user @​tamarinvs19 in https://github.com/python-caldav/caldav/pull/327
• DAVResponse.davclient was always set to None, now it may be set to the DAVClient instance. Credits to github user @​sobolevn in https://github.com/python-caldav/caldav/pull/323
• DAVResponse.davclient was always set to None, now it may be set to the DAVClient instance. Credits to github user @​sobolevn in https://github.com/python-caldav/caldav/pull/323
• examples/sync_examples.py, the sync token needs to be saved to the database (credits to Savvas Giannoukas)
• Bugfixes in set_relations, credits to github user @​Zocker1999NET in https://github.com/python-caldav/caldav/pull/335 and https://github.com/python-caldav/caldav/pull/333
• Dates that are off the scale are converted to min_date and max_date (and logging en error) rather than throwing OverflowError, credits to github user @​tamarinvs19 in https://github.com/python-caldav/caldav/pull/327
• Completing a recurring task with a naïve or floating DTSTART would cause a runtime error
• Tests stopped working on python 3.7 and python 3.8 for a while. This was only an issue with libraries used for the testing, and has been mended.
• Bugfix that a 500 internal server error could cause an recursion loop, credits to github user @​bchardin in https://github.com/python-caldav/caldav/pull/344
• Compatibility-fix for Google calendar, credits to github user @​e-katov in https://github.com/python-caldav/caldav/pull/344
• Spelling, grammar and removing a useless regexp, credits to github user @​scop in https://github.com/python-caldav/caldav/pull/337
• Faulty icalendar code caused the code for fixing faulty icalendar code to break, credits to github user @​yuwash in https://github.com/python-caldav/caldav/pull/347 and https://github.com/python-caldav/caldav/pull/350
• Sorting on uppercase attributes didn't work, ref issue https://github.com/python-caldav/caldav/issues/352 - credits to github user @​ArtemIsmagilov.
• The sorting algorithm was dependent on vobject library - refactored to use icalendar library instead
• Lots more test code on the sorting, and fixed some corner cases
• Creating a task with a status didn't work

v1.3.8

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Why do I never manage to do releases right ..

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.68%. Comparing base (acf0a46) to head (d243be0).

Additional details and impacted files

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  Coverage   94.68%   94.68%           
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  Files          46       46           
  Lines        5364     5364           
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  Hits         5079     5079           
  Misses        285      285