Update dependency pendulum to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pendulum (source)	==2.1.2 -> ==3.0.0

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Release Notes

sdispater/pendulum (pendulum)

v3.0.0

Compare Source

Changed

• Relaxed dependency constraints. #​760
• The testing helpers are now optional and must be opted-in via the test extra. #​778

Fixed

• Removed remaining mentions of periods instead of intervals. #​757
• Fixed the behavior of the week_of_month property for edge cases in January and December. #​774
• Fixed the handling of the fold attribute when deep-copying a DateTime instance. #​776
• Fixed errors where hours and days were not handled properly when adding durations. #​775
• Fixed errors where hours and days were not handled properly when adding durations. #​775

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