chore(deps): update dependency plexapi to v4.15.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.2 -> ==4.15.3

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.3`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.3) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.2...4.15.3) ### Bug Fixes - [https://github.com/pkkid/python-plexapi/pull/1260](https://togithub.com/pkkid/python-plexapi/pull/1260) - Fix handling of live TV sessions

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