qt: Fix compiling for Windows

Static builds for Windows now require Qt 6.7 or newer. This holds
automatically to cross-compiled builds.

Author: hebasto

src/qt/CMakeLists.txt

@@ -19,7 +19,7 @@ function(import_plugins target)
     if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
       list(APPEND plugins Qt6::QXcbIntegrationPlugin)
     elseif(WIN32)
-      list(APPEND plugins Qt6::QWindowsIntegrationPlugin Qt6::QWindowsVistaStylePlugin)
+      list(APPEND plugins Qt6::QWindowsIntegrationPlugin Qt6::QModernWindowsStylePlugin)
     elseif(APPLE)
       list(APPEND plugins Qt6::QCocoaIntegrationPlugin Qt6::QMacStylePlugin)
     endif()