deps: remove upper bound on packaging dependency

[tswast]

Towards #1435

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Towards #1435
Fixes #1400
🦕

[chalmerlowe]

LGTM

[tswast]

TODO: Need to investigate unit test failure:

______ TestPyarrowVersions.test_installed_version_returns_parsed_version _______

self = <tests.unit.test__helpers.TestPyarrowVersions testMethod=test_installed_version_returns_parsed_version>

    def test_installed_version_returns_parsed_version(self):
        versions = self._object_under_test()

        with mock.patch("pyarrow.__version__", new="1.2.3"):
            version = versions.installed_version

>       assert version.major == 1
E       AttributeError: 'Version' object has no attribute 'major'

[hirosassa]

Thank you for your PR. I'm also struggling this problem.

I added a small comment.

[hirosassa]

@tswast It looks that the problem you suggest comes from this version constraint.

v14.3 of packaging has no major attribute:
https://github.com/pypa/packaging/blob/14.3/packaging/version.py#L268-L280

I think we need to update the lower bound, too.

[hirosassa]

major is added since v20.0.

ref: https://github.com/pypa/packaging/releases/tag/20.0

[parthea]

@tswast See related issue #1400