Qt WebEngine 6.5 affected by libc++ compatibility break

The issue described at https://bugs.chromium.org/p/chromium/issues/detail?id=1449299 prevents Qt WebEngine 6.5 from being built with Clang 17. The "6.7" branch uses Chromium 116 which contains the fix. See:

• https://github.com/qt/qtwebengine-chromium/blame/f72de4ed3420e5565fb7c99ac555073376c89044/chromium/base/containers/checked_iterators.h#L252-L262
• https://github.com/qt/qtwebengine-chromium/blame/f72de4ed3420e5565fb7c99ac555073376c89044/chromium/base/containers/checked_iterators_unittest.cc#L129-L146

Please backport this to Qt 6.5 LTS