Building unittest fails with GCC 14 / Qt 6.8.2

The build log shows:

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-I/gnu/store/q31dqnln6kd1wrlbqn0scn4yk3ffcxzw-gdk-pixbuf-2.42.12/include/gdk-pixbuf-2.0 -I/gnu/store/1dlwzyjk51xbn1k7v7b010gidrxxvida-libpng-1.6.39/include/libpng16 -fPIC -std=gnu++17 -MD -MT CMakeFiles/jami.dir/src/app/mediacodeclistmodel.cpp.o -MF CMakeFiles/jami.dir/src/app/mediacodeclistmodel.cpp.o.d -o CMakeFiles/jami.dir/src/app/mediacodeclistmodel.cpp.o -c /tmp/guix-build-jami-20250613.0.drv-0/source/src/app/mediacodeclistmodel.cpp
/tmp/guix-build-jami-20250613.0.drv-0/source/tests/unittests/previewengine_unittest.cpp: In member function ‘virtual void PreviewEngineFixture::SetUp()’:
/tmp/guix-build-jami-20250613.0.drv-0/source/tests/unittests/previewengine_unittest.cpp:31:17: error: ‘class QHttpServer’ has no member named ‘listen’
   31 |         server->listen(QHostAddress::LocalHost, 8000);
      |                 ^~~~~~