Release 9.1.0 - Githubissues

[x] Secure the CI is green on git master
[x] Check if minimal versions of library dependences is properly given in Meson
[x] Update subprojects with appropriate library dependence versions (like in kiwix-build)
[ ] Check if Debian package has to be updated
[x] Update Homebrew package
[x] Kiwix-Build is OK
[x] Update the Changelog
[x] Update version
[x] Close current milestone and create new one incrementaly (a priori a minor version)
[x] Create a tag on git
[x] Ensure new sources/binaries are published on https://download.openzim.org/release/libzim/
[x] Update the Github release with the Changelog
[x] Check Brew packaging
[x] Check if release has been a success on PPA
[ ] Create new empty entry in Changelog (placeholder for future entries)
[x] Publicize these new versions

openzim / libzim