[FTBFS] QtCore doc snippets link to QtWidgets

FAILED: qtbase/src/corelib/doc/snippets/CMakeFiles/corelib_snippets.dir/qrangemodel/main.cpp.o 
/home/tjmaciei/bin/g++ -DQT_CORE_LIB -I/home/tjmaciei/obj/qt/qt6-release/qtbase/include -I/home/tjmaciei/obj/qt/qt6-release/qtbase/include/QtCore -I/home/tjmaciei/src/qt/qt6-release/qtbase/mkspecs/linux-g++ -O3 -march=skylake-avx512 -mprefer-vector-width=256 -maes -fdiagnostics-color=always -std=gnu++23 -flto=auto -fno-fat-lto-objects -fPIC -Wall -Wextra -Wno-expansion-to-defined -mno-direct-extern-access -MD -MT qtbase/src/corelib/doc/snippets/CMakeFiles/corelib_snippets.dir/qrangemodel/main.cpp.o -MF qtbase/src/corelib/doc/snippets/CMakeFiles/corelib_snippets.dir/qrangemodel/main.cpp.o.d -o qtbase/src/corelib/doc/snippets/CMakeFiles/corelib_snippets.dir/qrangemodel/main.cpp.o -c /home/tjmaciei/src/qt/qt6-release/qtbase/src/corelib/doc/snippets/qrangemodel/main.cpp
/home/tjmaciei/src/qt/qt6-release/qtbase/src/corelib/doc/snippets/qrangemodel/main.cpp:8:10: fatal error: QtWidgets/qapplication.h: No such file or directory
    8 | #include <QtWidgets/qapplication.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~