Python 3.9 has become EoL - remove from Python versions
According to https://devguide.python.org/versions/, Python 3.9 becomes EoL this month. Remove it from .python:versions defined in python-common.yml.
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According to https://devguide.python.org/versions/, Python 3.9 becomes EoL this month. Remove it from .python:versions defined in python-common.yml.