Python 3.11 is officially supported

Author: mr-c

README.rst

@@ -51,7 +51,7 @@ intended to be feature complete and provide comprehensive validation of CWL
 files as well as provide other tools related to working with CWL.
 
 This is written and tested for
-`Python <https://www.python.org/>`_ ``3.x {x = 6, 7, 8, 9, 10}``
+`Python <https://www.python.org/>`_ ``3.x {x = 6, 7, 8, 9, 10, 11}``
 
 The reference implementation consists of two packages.  The ``cwltool`` package
 is the primary Python module containing the reference implementation in the