Update omniauth-azure-oauth2 to 0.0.9 (Support Office 365 Germany)

Originally opened at !13853 (closed).

---

This MR updates the omniauth-azure-oauth2 to support Office365 Germany. Office365 is a special version of Microsoft Cloud Service which uses a different base url. The gems supports this use case.

https://github.com/KonaTeam/omniauth-azure-oauth2/commit/8c29236c4b8e300f9a330da984e02c28b34b3ed6

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

Why was this MR needed?

Auth via Office365 Germany not possible.

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together