Set Gitleaks entropy scale to maximum

What does this MR do?

Our default entropy threshold is too low, so for a quick fix we set this to maximum. It's already exposed as a configurable option for users who would like to set otherwise

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/10384

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