fix: curl timeout

What does this MR do?

Curl uses a timeout when checking if a target website is up. The timeout did not work was expected. To limit the total time, parameter --retry-max-time needs to be used. Before --max-time was used, which just limits the time one individual retry takes.

Also see https://stackoverflow.com/a/13554435

What are the relevant issue numbers?

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