chore(deps): update dependency plexapi to v4.15.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.14 -> ==4.15.15

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.15`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.15) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.14...4.15.15) ### New Features - [#​1437](https://togithub.com/pkkid/python-plexapi/issues/1437) - add searchProviders parameter to searchDiscover method *** Thanks to new contributor [@​mdinicola](https://togithub.com/mdinicola).

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