contrib/import-checker.py

--- a/contrib/import-checker.py	Tue Mar 07 13:39:31 2023 +0100
+++ b/contrib/import-checker.py	Tue Mar 07 23:38:14 2023 -0500
@@ -232,6 +232,7 @@
     yield 'importlib.abc'  # python3 only
     yield 'importlib.machinery'  # python3 only
     yield 'importlib.util'  # python3 only
+    yield 'packaging.version'
     for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only
         yield m
     for m in 'cPickle', 'datetime':  # in Python (not C) on PyPy