Upgrade Container Scanning analyzer to version 6

What does this MR do and why?

In GitLab 16.0, we're bumping the version of the Container Scanning analyzer from 5.x to 6.0.0.

This MR updates the container scanning CI template to use the new version.

Testing

Tested here.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #408803 (closed)