app-editors/appflowy-bin: add 0.7.0, drop 0.6.9

[Linerre]

close #5287

[github-actions[bot]]

:heavy_check_mark: pkgcheck checks passed

• pkgcheck 0.10.30
• the corresponding ::gentoo commit: https://github.com/gentoo-mirror/gentoo/commit/dbabbf7c0a40121fbb55afa844c52719b453f5b7