Changes the minimal SIP version required by Cmake from 4.18 to 4.19.13

Krita Python plugin compilation fails when SIP is in the version lower than 4.19.9. Since the file [source directory]/dev-tools/python/dev-requirements.txt mentions the minimum version required to be 4.19.13, this patch sets Cmake requirement to the same version.

Differential Revision:https://phabricator.kde.org/D18799