appdata: use "~" in 44 RC release for it to be sorted correctly
Otherwise, it will sort after 44.0, and fail validation and CI https://www.freedesktop.org/software/appstream/docs/chap-AppStream-Misc.html#sect-AppStream-Misc-VerCmp
Otherwise, it will sort after 44.0, and fail validation and CI https://www.freedesktop.org/software/appstream/docs/chap-AppStream-Misc.html#sect-AppStream-Misc-VerCmp