chore(deps): update dependency plexapi to v4.15.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.5 -> ==4.15.6

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.6`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.6) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.5...4.15.6) ### Bug Fixes - [#​1287](https://togithub.com/pkkid/python-plexapi/issues/1287) - Fix `batchMultiEdits()` for collections ### New Features - [#​1284](https://togithub.com/pkkid/python-plexapi/issues/1284) - Use edit mixins for Playlists - [#​1286](https://togithub.com/pkkid/python-plexapi/issues/1286) - Add support for 'group' and 'having' keys in smart filters - [#​1288](https://togithub.com/pkkid/python-plexapi/issues/1288) - Add sonicallySimilar method to Audio class - [#​1293](https://togithub.com/pkkid/python-plexapi/issues/1293) - feat: add PlexPartialObject.isLocked method ### Improvements - [#​1294](https://togithub.com/pkkid/python-plexapi/issues/1294) - tests: improve audio tests - [#​1289](https://togithub.com/pkkid/python-plexapi/issues/1289) - style(typehints): replace string typehints - [#​1295](https://togithub.com/pkkid/python-plexapi/issues/1295) - doc: fix documentation for BaseResource.provider - [#​1297](https://togithub.com/pkkid/python-plexapi/issues/1297) - Fix flake8 [#​1295](https://togithub.com/pkkid/python-plexapi/issues/1295) *** Thanks to new contributor [@​zdimension](https://togithub.com/zdimension).

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