Release 3.4.0

[benoit74]

This issue serves as a checklist for the release event.

• [ ] Secure the CI is green on git main
• [ ] Check that dependencies ranges are ok, upgrade if needed
• [ ] Adjust version in __about__.py 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
• [ ] 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/python-scraperlib/releases and tagged Latest
• [ ] Check that version is published on Pypi at https://pypi.org/project/zimscraperlib/
• [ ] Create a new Github milestone with the next version incrementaly (a priori a minor one)
• [ ] 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 __about__.py to `x.y.z-dev0
• [ ] Inform #scrapers channel on Slack about the new version