Upgrade gitlab helm chart to 8.4.2
Context
What does this MR do and why?
Upgrade helm chart for gitlab-org/gitlab review-apps to 8.4.2
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Deployment
The review-app is deployed and accessible.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Edited by Nao Hashizume