Run GitHub Action tests when updating lock file

[bouweandela]

It would be nice to run the GitHub Action tests in .github/workflows/test.yml when we update the lock file, e.g. #4483, to ensure the new environment works with all Python versions and platforms we support.

Instructions are here: https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#triggering-further-workflow-runs

[valeriupredoi]

they run at merge into main point, immediately after the lockfile was updated and the PR was merged - the problems we see are not related to the state immediately after the lockfile was updated, but rather, a couple or more days after