Fix Gitlab::Access.values to Gitlab::Access.sym_options at 06_teams on development db fixtures

What does this MR do?

rake dev:setup aborted at 06_teams to fixtures.
Change argument of project.add_role from Number to String.

Why was this MR needed?

The Number argument is NoMethodError.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

#41513 (closed)