Release 3.1.0

[benoit74]

This issue serves as a checklist for the release event.

• [ ] Check that dependencies have been updated to latest version (especially python-scraper lib)
• [ ] Adjust version in VERSION to x.x.x
• [ ] Update Github milestone to match the issues that will be released
• [ ] Close Github milestone
• [ ] Update the Changelog so that it is in line with the content of Github milestone
• [ ] Push a tag on Github named vx.x.x (this will trigger the CI)
• [ ] Create a Github release, pointing to the tag, with the Changelog of this release
• [ ] Publish the Github release (this will trigger the CI, if the CI fails and you have to push a minor fix which does not justify to create a new version, you will have to delete the release and re-create it from scratch)
• [ ] Check that version is published as a Github release at https://github.com/openzim/sotoki/releases and tagged Latest
• [ ] Check that version is published on Pypi at https://pypi.org/project/sotoki/
• [ ] Check that version is published on Github Container Registry at https://ghcr.io/openzim/sotoki and tagged latest
• [ ] Create a new Github milestone with the next minor version incrementaly
• [ ] Create a new Github issue attached to this milestone with this checklist inside
• [ ] Create new ## [Unreleased] section in Changelog (placeholder for future entries)
• [ ] Adjust version in VERSION to x.y.z+1-dev0 (next patch a priori)
• [ ] Inform #scrapers Slack channel that a new release is ready to use
• [ ] Update Zimfarm recipes to use new release