Drop autopkgtest dependencies installed from rubygems.org

debian/tests/control

@@ -3,23 +3,9 @@ Depends: @,
   sudo,
   gem2deb-test-runner,
   ruby-rspec,
-  ruby-license-finder,
-  ruby-shoulda-matchers,
-  ruby-webmock,
-  ruby-simplecov,
-  ruby-factory-girl-rails, 
-  ruby-rspec-rails,
-  ruby-rspec-retry,
-  ruby-capybara,
-  ruby-poltergeist,
-  ruby-capybara-screenshot,
-  ruby-awesome-print,
-  ruby-fuubar,
-  ruby-database-cleaner,
-  ruby-email-spec,
-  ruby-ffaker,
-  ruby-json-schema,
-  ruby-sham-rack,
-  ruby-timecop,
+  ruby-dev,
+  gcc,
+  libc6-dev,
+  ruby-sqlite3,
   phantomjs
 Restrictions: needs-root