Bump plexapi from 4.8.0 to 4.9.1 (#1627)

* Bump plexapi from 4.8.0 to 4.9.1

Bumps [plexapi](https://github.com/pkkid/python-plexapi) from 4.8.0 to 4.9.1.
- [Release notes](https://github.com/pkkid/python-plexapi/releases)
- [Commits](https://github.com/pkkid/python-plexapi/compare/4.8.0...4.9.1)

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

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

* Update plexapi==4.9.1

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

lib/plexapi/server.py

@@ -3,6 +3,7 @@ from urllib.parse import urlencode
 from xml.etree import ElementTree
 
 import requests
+import os
 from plexapi import (BASE_HEADERS, CONFIG, TIMEOUT, X_PLEX_CONTAINER_SIZE, log,
                      logfilter)
 from plexapi import utils
@@ -228,10 +229,10 @@ class PlexServer(PlexObject):
         return activities
 
     def agents(self, mediaType=None):
-        """ Returns the :class:`~plexapi.media.Agent` objects this server has available. """
+        """ Returns a list of :class:`~plexapi.media.Agent` objects this server has available. """
         key = '/system/agents'
         if mediaType:
-            key += '?mediaType=%s' % mediaType
+            key += '?mediaType=%s' % utils.searchType(mediaType)
         return self.fetchItems(key)
 
     def createToken(self, type='delegation', scope='all'):
@@ -384,6 +385,18 @@ class PlexServer(PlexObject):
             for path, paths, files in self.walk(_path):
                 yield path, paths, files
 
+    def isBrowsable(self, path):
+        """ Returns True if the Plex server can browse the given path.
+
+            Parameters:
+                path (:class:`~plexapi.library.Path` or str): Full path to browse.
+        """
+        if isinstance(path, Path):
+            path = path.path
+        path = os.path.normpath(path)
+        paths = [p.path for p in self.browse(os.path.dirname(path), includeFiles=False)]
+        return path in paths
+
     def clients(self):
         """ Returns list of all :class:`~plexapi.client.PlexClient` objects connected to server. """
         items = []