update omniauth-github ~> 1.1.1 to ~> 1.3

What does this MR do?

Update omniauth-github ruby gem to latest version

Are there points in the code the reviewer needs to double check?

Double checking SemVer compliance https://github.com/omniauth/omniauth-github/issues/77

Why was this MR needed?

Debian already has a newer version and keeping dependencies in sync helps in packaging.

Screenshots (if relevant)

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
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?