remove packaging requirement

Author: mr-c

requirements.txt

@@ -11,5 +11,4 @@ coloredlogs
 pydot>=1.4.1
 argcomplete>=1.12.0
 pyparsing!=3.0.2  # breaks --print-dot (pydot) https://github.com/pyparsing/pyparsing/issues/319
-packaging<22
 cwl-utils>=0.22

setup.py

@@ -124,7 +124,6 @@
         "pydot >= 1.4.1",
         "argcomplete",
         "pyparsing != 3.0.2",  # breaks --print-dot (pydot) https://github.com/pyparsing/pyparsing/issues/319
-        "packaging<22",
         "cwl-utils >= 0.22",
     ],
     extras_require={