Fix deploy warning

[hugovk]

The deploy workflow shows this warning:

build: # >> PyPA publish to PyPI GHA: UNSUPPORTED GITHUB ACTION VERSION <<#L1 You are using "pypa/gh-action-pypi-publish@master". The "master" branch of this project has been sunset and will not receive any updates, not even security bug fixes. Please, make sure to use a supported version. If you want to pin to v1 major version, use "pypa/gh-action-pypi-publish@release/v1". If you feel adventurous, you may opt to use use "pypa/gh-action-pypi-publish@unstable/v1" instead. A more general recommendation is to pin to exact tags or commit shas.

https://github.com/jazzband/tablib/actions/runs/3664520628

So let's use v1.

---

Also we can make the github.repository == 'jazzband/tablib' check more generic as github.repository_owner == 'jazzband', so we can have fewer changes between Jazzband repos.

And similarly, use Python version 3.x for the latest available, instead of pinning to a specific.

[codecov[bot]]

Codecov Report

Merging #531 (34cfb7f) into master (4719f97) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #531   +/-   ##
=======================================
  Coverage   90.95%   90.95%           
=======================================
  Files          28       28           
  Lines        2652     2652           
=======================================
  Hits         2412     2412           
  Misses        240      240           

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