testing/{libime,fcitx5-*}: upgrade fcitx5 rdeps to latest, claim maintainership

testing/fcitx5-chinese-addons is no longer blocked by community/qt6-qtwebengine on armv7.

All other upgrades are minor changes.

Take maintainership of fcitx5-anthy, fcitx5-bamboo, fcitx5-lua and fcitx5-m17n