Update build command in tox.ini

[esunar]

Per [1], the way to build python packages should discourage the use of setup.py.

Instead of "setup.py sdist" (see [2]), "python -m build" should be used.

1. https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html
2. https://github.com/canonical/juju-verify/blob/4525ebf0c08d17c1df7f5072419325951ab09149/tox.ini#L53

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Imported from Launchpad using lp2gh.

• date created: 2021-10-21T07:33:27Z

• owner: aluria

• assignee: martin-kalcok

• the launchpad url

[esunar]

(by martin-kalcok) PR merged: https://github.com/canonical/juju-verify/pull/41