Update vendored Versioneer from 0.18 to 0.29

[m-aciek]

• installed the new Versioneer (pip install -U versioneer or equivalent)
• re-runned versioneer install --vendor in the local source tree, to replace transifex/_version.py
• committed all changed files

As specified in the guide (no changes to configuration were required).

Refs #106.

[n1k0sv]

I updated Makefile and added a new test target for python 3.12 with Django 4.2, and tests failed.

It looks like the issue is that the requests library is pinned to 2.22.0 in base.txt and it fails. Maybe we should pin to 2.* and let the environment pick the latest compatible version of the second major. What do you think?

[m-aciek]

I replaced "closes" keyword with "refs" not to close #106 with this PR merged.

It looks like the pins are used only in CI and for local development, so it should be fine to pin it to the latest requests version for reproducible CI. It's not a strong opinion though.

[n1k0sv]

@m-aciek You will need to sign (only once) the Transifex CLA before we can merge this PR, per our Contributing guidelines.

As soon as this happens, I can merge this PR. And thank you for contributing to this repo 🙏

[n1k0sv]

Hey @m-aciek, we have fixed the requests lib issue on devel branch. Can you please rebase?

Also did you manage to get the CLA signed?

[m-aciek]

Hey @nbasili, I've pushed the rebased changes. Also a few minutes ago I've sent the signed CLA.