Remove expectedFailure decorator for test_xml_encodings.

Author: DimitrisJim

Lib/test/test_plistlib.py

@@ -801,8 +801,6 @@ def test_integer_notations(self):
         value = plistlib.loads(pl)
         self.assertEqual(value, 123)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_xml_encodings(self):
         base = TESTDATA[plistlib.FMT_XML]