```
security/sandsifter: Switch from devel/capstone version 3 to 4
devel/py-capstone will soon be updated to version 4. As a result, packages
using devel/capstone3 library will most likely stop building as those two have
to be kept in sync.
security/sandsifter seems to build just fine with capstone4 so let's just bump
the version.
``