Bump plexapi from 4.13.4 to 4.15.15 (#55)

Bumps [plexapi](https://github.com/pkkid/python-plexapi) from 4.13.4 to 4.15.15.
- [Release notes](https://github.com/pkkid/python-plexapi/releases)
- [Commits](pkkid/python-plexapi@4.13.4...4.15.15)

---
updated-dependencies:
- dependency-name: plexapi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,5 +1,5 @@
 plex.py==0.9.0
-PlexAPI==4.13.4
+PlexAPI==4.15.15
 texttable
 python-dotenv
 requests