Upgrade to Trivy 0.16.0
Supports Alpine 3.13, as discovered when dogfooding: gitlab-org/gitlab#327071 (comment 550204754) and https://gitlab.com/gitlab-org/release-cli/-/jobs/1164906227#L22.
Contains other fixes: https://github.com/aquasecurity/trivy/releases/tag/v0.16.0.
Edited by Thiago Figueiró