Release 3.7.0

[kelson42]

• Check if library dependence version check has been updated properly in Meson
• CI is green on git main
• Kiwix-Build is OK
• Update the Changelog
• Update version
• Create a tag on git
• Secure new sources & binaries are published at https://download.kiwix.org/release/kiwix-tools
• Test Windows binaries work fine
• Test Linux binaries work fine
• Update the Github release with the Changelog
• Create new empty entry in Changelog (placeholder for future entries)
• Close current milestone and create new one incrementaly (a priori a minor version)
• Publicize these new versions