chore(deps): update dependency plexapi to v4.15.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PlexAPI	==4.15.3 -> ==4.15.4

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Release Notes

pkkid/python-plexapi (PlexAPI)

### [`v4.15.4`](https://togithub.com/pkkid/python-plexapi/releases/tag/4.15.4) [Compare Source](https://togithub.com/pkkid/python-plexapi/compare/4.15.3...4.15.4) ### Bug Fixes [#​1262](https://togithub.com/pkkid/python-plexapi/issues/1262) - Fix datetime returning UTC [#​1263](https://togithub.com/pkkid/python-plexapi/issues/1263) - Fix `isLatest()` and add `canInstallUpdate()` ### Improvements [#​1258](https://togithub.com/pkkid/python-plexapi/issues/1258) - ci: adjust plexapi timeout

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