d/control: Maintainer should be Debian Qt-KDE Team

https://salsa.debian.org/qt-kde-team/extras/kwin-bismuth/-/blob/master/debian/control#L4 should have Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>. It can have Volian Developers <volian-devel@volian.org> as other Uploaders entry.

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