[PATCH] AVRO-3672: Add CI testing for Python 3.11 (#1961) * AVRO-3672: Add CI testing for Python 3.11
* AVRO-3672: Fix setuptools warning
/home/runner/work/avro/avro/lang/py/.tox/build/lib/python3.10/site-packages/setuptools/config/setupcfg.py:508: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
* AVRO-3672: Override __str__ to return the Enum's value
It seems Python 3.11 changed its toString() for classes inheriting (str, Enum).
* AVRO-3672: Fix formatting
Martin Grigorov <martin-g@users.noreply.github.com>
