Update chrome and chromedriver versions to 84.*

What does this MR do?

Updates QA Dockerfile to capture latest matching versions of Chrome and chromedriver

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content