Track output of `check_versions.py` in a GitHub Actions workflow's job summary

What would change?

Add a GitHub Actions workflow that regularly runs check_versions.py, and use the "job summary" feature to make that visible in a more prominent location. This would allow linking to the workflow's page from the README, where the user can click into one of the jobs and see the version table as a "job summary".

https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-job-summary

The link from the README would be similar to this one for pypi-package.yml, and the job summary would be a markdown block presented like Build & verify package summary (this example uses <details> for dropdowns, and also attaches artifacts which are shown above the summary -- we likely wouldn't do either of those things).

What is the benefit of this?

This would eliminate the need for follow up bump PRs like #156 in the future, since the information would be automatically tracked and kept up to date via the regular re-runs of the script (with historical information as well, which is a nice side-effect?).

Commencez par lire et exécuter check_versions.py afin de comprendre la sortie de sa table des versions, puis examinez dans le README l’emplacement du lien vers le workflow. Ajoutez un workflow GitHub Actions exécuté régulièrement, qui expose la sortie du script sous forme de job summary, et ajoutez dans le README un lien vers le workflow ; le travail est terminé lorsque le résumé est visible depuis un workflow run et reste à jour.