Add SAST analyzers

As part of Replace sast-analyzer-deps-bot with renovate (gitlab-org/gitlab#557439), I'll be adding the following SAST analyzers to renovate:

• https://gitlab.com/gitlab-org/security-products/analyzers/semgrep
• https://gitlab.com/gitlab-org/security-products/analyzers/kics
• https://gitlab.com/gitlab-org/security-products/analyzers/kubesec
• https://gitlab.com/gitlab-org/security-products/analyzers/spotbugs
• https://gitlab.com/gitlab-org/security-products/analyzers/sobelow