Update dependency PlexAPI to v4.15.16

[renovate]

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

Compare Source

Breaking Changes

• #​1451 - Improve reload performance
  • Accessing MediaPart.exists and MediaPart.accessible attributes requires manually reloading with reload(checkFiles=True).

Bug Fixes

• #​1452 - Sanitize XML strings before parsing

New Features

• #​1453 - Add support for artist popular tracks
• #​1454 - Add UltraBlurColors objects

Improvements

• #​1441 - ci(pytest): add colored output
• #​1442 - ci(coverge): upload coverage if tests fail

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