update fog-aws 1.4 -> 2.0

What does this MR do?

Update fog-aws 1.4 -> 2.0 Only breaking change is drop in support for ruby < 2.0

https://github.com/fog/fog-aws/blob/master/CHANGELOG.md

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

Why was this MR needed?

Debian already has fog-aws 2.0 and it will help 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-qa manual pipeline job)

What are the relevant issue numbers?