cmake still wants to install python310 even when 312 is set

[Behinder (behinder)]

I checked the code in Portfile, it is stated there that if python version is set then variant is created for that version. In my case it is 3.12. `port select --list python Available versions for python:

none python312 (active)`

and cmake still want to use 3.10 which is wrong. It is even more wrong that C build system uses Python as dependency.