Bump plexapi from 4.15.15 to 4.15.16 (#2383)

* Bump plexapi from 4.15.15 to 4.15.16

Bumps [plexapi](https://github.com/pkkid/python-plexapi) from 4.15.15 to 4.15.16.
- [Release notes](https://github.com/pkkid/python-plexapi/releases)
- [Commits](https://github.com/pkkid/python-plexapi/compare/4.15.15...4.15.16)

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

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

* Update plexapi==4.15.16

---------

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

[skip ci]

lib/plexapi/utils.py

@@ -6,6 +6,7 @@ import logging
 import os
 import re
 import string
+import sys
 import time
 import unicodedata
 import warnings
@@ -673,3 +674,45 @@ def openOrRead(file):
 def sha1hash(guid):
     """ Return the SHA1 hash of a guid. """
     return sha1(guid.encode('utf-8')).hexdigest()
+
+
+# https://stackoverflow.com/a/64570125
+_illegal_XML_characters = [
+    (0x00, 0x08),
+    (0x0B, 0x0C),
+    (0x0E, 0x1F),
+    (0x7F, 0x84),
+    (0x86, 0x9F),
+    (0xFDD0, 0xFDDF),
+    (0xFFFE, 0xFFFF),
+]
+if sys.maxunicode >= 0x10000:  # not narrow build
+    _illegal_XML_characters.extend(
+        [
+            (0x1FFFE, 0x1FFFF),
+            (0x2FFFE, 0x2FFFF),
+            (0x3FFFE, 0x3FFFF),
+            (0x4FFFE, 0x4FFFF),
+            (0x5FFFE, 0x5FFFF),
+            (0x6FFFE, 0x6FFFF),
+            (0x7FFFE, 0x7FFFF),
+            (0x8FFFE, 0x8FFFF),
+            (0x9FFFE, 0x9FFFF),
+            (0xAFFFE, 0xAFFFF),
+            (0xBFFFE, 0xBFFFF),
+            (0xCFFFE, 0xCFFFF),
+            (0xDFFFE, 0xDFFFF),
+            (0xEFFFE, 0xEFFFF),
+            (0xFFFFE, 0xFFFFF),
+            (0x10FFFE, 0x10FFFF),
+        ]
+    )
+_illegal_XML_ranges = [
+    fr'{chr(low)}-{chr(high)}'
+    for (low, high) in _illegal_XML_characters
+]
+_illegal_XML_re = re.compile(fr'[{"".join(_illegal_XML_ranges)}]')
+
+
+def cleanXMLString(s):
+    return _illegal_XML_re.sub('', s)