chore(deps): update dependency plexapi to v4.15.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.7 -> ==4.15.8

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Release Notes

pkkid/python-plexapi (PlexAPI)

v4.15.8

Compare Source

Bug Fixes

• #​1326 - Use 4k chunk size (powers of 2) for download
• #​1329 - Also catch ValueError when converting timestamp to datetime
• #​1336 - Fix MyPlexPinLogin doc strings
• #​1347 - bugfix: pass existing filters for albums method of Artist
• #​1350 - Fix: Update guid filter examples for fetchItems

New Features

• #​1319 - Adds 2FA code input to tools/plex-gettoken.py
• #​1327 - Add warning for ambiguous library title
• #​1339 - Add SplitMergeMixin to Album

Improvements

• #​1320 - fix(scripts): offset butler tasks to reduce ci random failures
• #​1328 - Simplify building MediaPartStream objects
• #​1340 - Refactor cast function in utils.py

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