www/cutelyst: update to 3.2.0, latest upstream

Release notes are here:
https://github.com/cutelyst/cutelyst/releases/tag/v3.2.0
https://dantti.wordpress.com/2021/12/01/cutelyst-3-2-and-asql-0-50-are-out/
Bugfixes, more use of std::shared_ptry (over QSharedPointer, which
pre-dates most C++ standardization in that area).