Bump rugged from 1.7.1 to 1.7.2

Bumps [rugged](https://github.com/libgit2/rugged) from 1.7.1 to 1.7.2.
- [Release notes](https://github.com/libgit2/rugged/releases)
- [Changelog](https://github.com/libgit2/rugged/blob/master/CHANGELOG.md)
- [Commits](libgit2/rugged@v1.7.1...v1.7.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -257,7 +257,7 @@ GEM
       railties (>= 3.1, < 7.2)
     ruby2_keywords (0.0.5)
     rubypants (0.7.1)
-    rugged (1.7.1)
+    rugged (1.7.2)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)