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

[renovate[bot]]

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`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.8) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.7...4.15.8) ### Bug Fixes - [#​1326](https://togithub.com/pkkid/python-plexapi/issues/1326) - Use 4k chunk size (powers of 2) for download - [#​1329](https://togithub.com/pkkid/python-plexapi/issues/1329) - Also catch `ValueError` when converting timestamp to datetime - [#​1336](https://togithub.com/pkkid/python-plexapi/issues/1336) - Fix `MyPlexPinLogin` doc strings - [#​1347](https://togithub.com/pkkid/python-plexapi/issues/1347) - bugfix: pass existing filters for `albums` method of `Artist` - [#​1350](https://togithub.com/pkkid/python-plexapi/issues/1350) - Fix: Update guid filter examples for fetchItems ### New Features - [#​1319](https://togithub.com/pkkid/python-plexapi/issues/1319) - Adds 2FA code input to `tools/plex-gettoken.py` - [#​1327](https://togithub.com/pkkid/python-plexapi/issues/1327) - Add warning for ambiguous library title - [#​1339](https://togithub.com/pkkid/python-plexapi/issues/1339) - Add SplitMergeMixin to Album ### Improvements - [#​1320](https://togithub.com/pkkid/python-plexapi/issues/1320) - fix(scripts): offset butler tasks to reduce ci random failures - [#​1328](https://togithub.com/pkkid/python-plexapi/issues/1328) - Simplify building `MediaPartStream` objects - [#​1340](https://togithub.com/pkkid/python-plexapi/issues/1340) - Refactor cast function in utils.py

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