Update rugged requirement from = 1.7.2 to = 1.9.0 (#333)

Updates the requirements on [rugged](https://github.com/libgit2/rugged) to permit the latest version.
- [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: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -5,7 +5,7 @@ PATH
       dependabot-omnibus (= 0.217.0)
       github-linguist (= 9.0.0)
       json (= 2.7.1)
-      rugged (= 1.7.2)
+      rugged (= 1.9.0)
 
 GEM
   remote: https://rubygems.org/
@@ -222,7 +222,7 @@ GEM
       parser (>= 3.3.1.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
-    rugged (1.7.2)
+    rugged (1.9.0)
     sawyer (0.9.2)
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)

dependabot-linguist.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
 
-  spec.add_dependency "rugged", "1.7.2"
+  spec.add_dependency "rugged", "1.9.0"
   spec.add_dependency "github-linguist", "9.0.0"
   # All ecosystem gems from https://rubygems.org/profiles/dependabot can be
   # required via https://rubygems.org/gems/dependabot-omnibus/versions/0.217.0