Bump rugged from 1.7.2 to 1.9.0

Bumps [rugged](https://github.com/libgit2/rugged) from 1.7.2 to 1.9.0.
- [Release notes](https://github.com/libgit2/rugged/releases)
- [Changelog](https://github.com/libgit2/rugged/blob/master/CHANGELOG.md)
- [Commits](libgit2/rugged@v1.7.2...v1.9.0)

---
updated-dependencies:
- dependency-name: rugged
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -175,7 +175,7 @@ GEM
       railties (>= 5.2, < 8.1)
     ruby2_keywords (0.0.5)
     rubypants (0.7.1)
-    rugged (1.7.2)
+    rugged (1.9.0)
     securerandom (0.4.1)
     shoulda (4.0.0)
       shoulda-context (~> 2.0)