Bump plexapi from 4.12.1 to 4.13.1 (#1888)

Bumps [plexapi](https://github.com/pkkid/python-plexapi) from 4.12.1 to 4.13.1.
- [Release notes](https://github.com/pkkid/python-plexapi/releases)
- [Commits](https://github.com/pkkid/python-plexapi/compare/4.12.1...4.13.1)

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

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

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

[skip ci]

lib/plexapi/photo.py

@@ -3,7 +3,7 @@ import os
 from urllib.parse import quote_plus
 
 from plexapi import media, utils, video
-from plexapi.base import Playable, PlexPartialObject
+from plexapi.base import Playable, PlexPartialObject, PlexSession
 from plexapi.exceptions import BadRequest
 from plexapi.mixins import (
     RatingMixin,
@@ -79,12 +79,12 @@ class Photoalbum(
             Parameters:
                 title (str): Title of the photo album to return.
         """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItem(key, Photoalbum, title__iexact=title)
 
     def albums(self, **kwargs):
         """ Returns a list of :class:`~plexapi.photo.Photoalbum` objects in the album. """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItems(key, Photoalbum, **kwargs)
 
     def photo(self, title):
@@ -93,12 +93,12 @@ class Photoalbum(
             Parameters:
                 title (str): Title of the photo to return.
         """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItem(key, Photo, title__iexact=title)
 
     def photos(self, **kwargs):
         """ Returns a list of :class:`~plexapi.photo.Photo` objects in the album. """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItems(key, Photo, **kwargs)
 
     def clip(self, title):
@@ -107,12 +107,12 @@ class Photoalbum(
             Parameters:
                 title (str): Title of the clip to return.
         """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItem(key, video.Clip, title__iexact=title)
 
     def clips(self, **kwargs):
         """ Returns a list of :class:`~plexapi.video.Clip` objects in the album. """
-        key = '/library/metadata/%s/children' % self.ratingKey
+        key = f'{self.key}/children'
         return self.fetchItems(key, video.Clip, **kwargs)
 
     def get(self, title):
@@ -226,7 +226,7 @@ class Photo(
     def _prettyfilename(self):
         """ Returns a filename for use in download. """
         if self.parentTitle:
-            return '%s - %s' % (self.parentTitle, self.title)
+            return f'{self.parentTitle} - {self.title}'
         return self.title
 
     def photoalbum(self):
@@ -282,7 +282,7 @@ class Photo(
 
         section = self.section()
 
-        sync_item.location = 'library://%s/item/%s' % (section.uuid, quote_plus(self.key))
+        sync_item.location = f'library://{section.uuid}/item/{quote_plus(self.key)}'
         sync_item.policy = Policy.create(limit)
         sync_item.mediaSettings = MediaSettings.createPhoto(resolution)
 
@@ -291,3 +291,16 @@ class Photo(
     def _getWebURL(self, base=None):
         """ Get the Plex Web URL with the correct parameters. """
         return self._server._buildWebURL(base=base, endpoint='details', key=self.parentKey, legacy=1)
+
+
+@utils.registerPlexObject
+class PhotoSession(PlexSession, Photo):
+    """ Represents a single Photo session
+        loaded from :func:`~plexapi.server.PlexServer.sessions`.
+    """
+    _SESSIONTYPE = True
+
+    def _loadData(self, data):
+        """ Load attribute values from Plex XML response. """
+        Photo._loadData(self, data)
+        PlexSession._loadData(self, data)