cmake: don't use FindPython{2,3}
cmake: don't use FindPython{2,3}

this module is available only from cmake 3.12 onwards

electronic-structure/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius