update configs to support browserker 0.0.20

What does this MR do?

Upgrades browserker to v0.0.20:

• Renames Headless to ShowBrowser
• Implements a fix for navigation failures
• Implements component level logging

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/security-products/analyzers/browserker/-/issues/85
• https://gitlab.com/gitlab-org/security-products/analyzers/browserker/-/merge_requests/127
• https://gitlab.com/gitlab-org/security-products/analyzers/browserker/-/issues/78

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer