chore(deps): update dependency plexapi to v4.15.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.6 -> ==4.15.7

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.7`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.7) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.6...4.15.7) ### Breaking Changes - Added `subtitleStream` as first argument to `Video.removeSubtitles` ([#​1305](https://togithub.com/pkkid/python-plexapi/issues/1305)) ### Bug Fixes - [#​1300](https://togithub.com/pkkid/python-plexapi/issues/1300) - Fix building documentation - [#​1304](https://togithub.com/pkkid/python-plexapi/issues/1304) - Guard against None `parentIndex` - [#​1308](https://togithub.com/pkkid/python-plexapi/issues/1308) - Fix subtitleLanguage attribute ### New Features - [#​1303](https://togithub.com/pkkid/python-plexapi/issues/1303) - Add `lyricStreams()` convenience method - [#​1305](https://togithub.com/pkkid/python-plexapi/issues/1305) - Add support for on-demand subtitles ### Improvements - [#​1298](https://togithub.com/pkkid/python-plexapi/issues/1298) - test: fix test_audio_Audio_sonicallySimilar authenticated test - [#​1306](https://togithub.com/pkkid/python-plexapi/issues/1306) - Remove DeprecationWarning for watched methods - [#​1310](https://togithub.com/pkkid/python-plexapi/issues/1310) - docs: update butler tasks info *** Thanks to new contributor [@​iDentitY4](https://togithub.com/iDentitY4).

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