Update dependency PlexAPI to v4.15.13

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.12 -> ==4.15.13

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Release Notes

pkkid/python-plexapi (PlexAPI)

v4.15.13

Compare Source

Bug Fixes

• #​1404 - Fix escape sequence in docstring regex
• #​1413 - (Temporary Fix) Changed friends route to the v2 sharings route
• #​1416 - Update default language for library add

New Features

• #​1411 - Allow adding items from different server to playlist
• #​1417 - Add support for editing audience ratings and critic ratings

Improvements

• #​1405 - Increase on-demand subtitles test timeout

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Thanks to new contributor @​JamsRepos.

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