chore(deps): update dependency plexapi to v4.15.16

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.15 -> ==4.15.16

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.16`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.16) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.15...4.15.16) ##### Breaking Changes - [#​1451](https://togithub.com/pkkid/python-plexapi/issues/1451) - Improve reload performance - Accessing `MediaPart.exists` and `MediaPart.accessible` attributes requires manually reloading with `reload(checkFiles=True)`. ##### Bug Fixes - [#​1452](https://togithub.com/pkkid/python-plexapi/issues/1452) - Sanitize XML strings before parsing ##### New Features - [#​1453](https://togithub.com/pkkid/python-plexapi/issues/1453) - Add support for artist popular tracks - [#​1454](https://togithub.com/pkkid/python-plexapi/issues/1454) - Add UltraBlurColors objects ##### Improvements - [#​1441](https://togithub.com/pkkid/python-plexapi/issues/1441) - ci(pytest): add colored output - [#​1442](https://togithub.com/pkkid/python-plexapi/issues/1442) - ci(coverge): upload coverage if tests fail

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