Bump plexapi from 4.12.1 to 4.13.0

Bumps [plexapi](https://github.com/pkkid/python-plexapi) from 4.12.1 to 4.13.0.
- [Release notes](https://github.com/pkkid/python-plexapi/releases)
- [Commits](https://github.com/pkkid/python-plexapi/compare/4.12.1...4.13.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,4 +1,4 @@
-PlexAPI==4.12.1
+PlexAPI==4.13.0
 tmdbapis==1.0.6
 arrapi==1.3.1
 lxml==4.9.1