Update rugged to 0.25.1.1

What does this MR do?

It updates rugged to 0.25.1.1. It's a continuation of !8538 (closed).

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

libgit2 redefined sorting options, I updated the code, the discussion starts here - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8538#note_22461988

Why was this MR needed?

New version of rugged has a few bug fixes that we need.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • [ ] Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/17325

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14972

Closes #14765 (closed)

changelogs/unreleased/17325-rugged-gem-update.yml

+---
+title: Update rugged to 0.25.1.1
+merge_request: 10286
+author: Elan Ruusamäe