Correct "YAML" => "TOML" method name typo

What does this MR do?

Innocent typo change I came across

What are the relevant issue numbers?

N/A

Does this MR meet the acceptance criteria?

• Changelog entry added -- none needed
• 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 updated/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