devel/cmake*: Update to 3.31.7

kde@ is aware that CMake 4.0.x is out, but an update at this time would
likely entail fallout from 500+ ports, which we'd rather let upstream
projects deal with until fixing problems ourselves reaches a manageable
level. Most of these are easily fixable, but it's still a lot to clear
for a very small team with other projects to consider. See, for example:
https://build.opensuse.org/project/show/home:simotek:cmake4

https://www.kitware.com/cmake-3-31-7-available-for-download/