Add support for CVSS 4.0 #40
Description
Added support for the new CVSS 4.0 schema. The CVSS 4.0 standard introduces additional metrics for a more comprehensive evaluation of vulnerability risk. It is already integrated into a wide range of tools, including GitHub Security Lab, Invicti, and others. The library allows users to calculate base scores using CVSS versions 4.0, 3.1, or 3.0.