Add CVSS v4.0 support, fix CVSS v2.0 invalid calculator link

[pandatix]

What type of PR is this?

/kind feature
/kind cleanup

What this PR does / why we need it:

FIRST.ORG SIG CVSS (which I'm part of) released CVSS v4.0 months ago, and we see adoption going on in the whole ecosystem. Nevertheless, Kubernetes is not ready yet to handle those new vectors... but not for long ! 🎉

Through this PR, I bring the possibility to handle CVSS v4.0 vector strings. Moreover, I fix the calculator link computation as the FIRST.ORG does not have a calculator for CVSS v2.0, which technically produced 404 URLs despite it is no longer used by the community.

Which issue(s) this PR fixes:

Did not open an issue for the CVSS v2.0 calculator link, though it was irrelevant as will affect people relying on CVSS v2.0 vector strings which will most likely be nobody.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @pandatix. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pandatix
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