Update helm docker image to v3.4.2

What does this MR do?

A new version of the helm docker image is available, and this MR brings it in. Holding back from updating kubesec to v2.8.0 because there is no published docker image which matches it. Issue coming for that in a bit.

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/security-products/release/-/issues/104

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
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer