* 🚑 Explicitly set encoding @ `subprocess.run()`
This invocation is present in the `test_issue_9765` regression test
that is always skipped unconditionally, resulting in the
`EncodingWarning` never manifesting itself in CI or development
environments of the contributors.
* Change `setup.py` call w/ `pip install` @ tests
Using this CLI interface has been deprecated in `setuptools` [[1]].
[1]: https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html
fe4961afae