ARROW-5043: [Release][Ruby] Fix dependency error in verification script

We ensure using red-arrow in the release archive.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #4058 from kou/release-fix-ruby-test and squashes the following commits:

aa7e925 <Kouhei Sutou>  Fix dependency error in verification script

dev/release/verify-release-candidate.sh

@@ -289,6 +289,9 @@ test_ruby() {
 
   for module in ${modules}; do
     pushd ${module}
+    if [ "${module}" != "red-arrow" ]; then
+      echo 'gem "red-arrow", path: "../red-arrow"' >> Gemfile
+    fi
     bundle install --path vendor/bundle
     bundle exec ruby test/run-test.rb
     popd