Bump Trivy image from 0.48.0 to 0.49.1

What does this MR do?

• Bumps Trivy image from 0.48.0 to 0.49.1

Why are we doing this?

• To keep up to date with the latest features and security fixes with the upstream image

Testing

I have tested this image against the Gitlab Agent by triggering a scan.

What are the relevant issue numbers?

Composition Analysis - Reaction Rotation for 16.10 (gitlab-org/secure/general#297 - closed)