RFC: lookandfeel/sddm-theme/metadata.desktop: Add QtVersion=6
With https://github.com/sddm/sddm/pull/1789, SDDM will support Qt 5 and Qt 6 themes alongside each other. Themes which use Qt 6 need to specify this in their metadata.desktop
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That PR isn't merged yet, so discussion and comments are welcome. If it's about the handling in SDDM itself that should probably be done on the linked PR though.