[Bug libstdc++/95832] std::vector specialization leading std::variant ctor treating it as int rather than bool

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95832

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
cppreference and libstdc++ both need to be updated to implement
http://wg21.link/p1957