Bump packaging version to 22.0 to fix setuptools install issue

[reiniscirpons]

Was having issues installing the libsemigroups_pybind11 package earlier today with the error:

File "/tmp/pip-build-env-3v2o_037/overlay/lib/python3.12/site-packages/setuptools/_core_metadata.py", line 290, in _distribution_fullname
          canonicalize_version(version, strip_trailing_zero=False),
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      TypeError: canonicalize_version() got an unexpected keyword argument 'strip_trailing_zero'

As per pypa/setuptools#4483 it seems this has something to do with setuptools versions above 71.0 and packaging below version 22.0. As a fix I've bumped the packaging package version.