Bump rubyzip from 1.2.2 to 1.3.0 in /examples/rails_app

Bumps [rubyzip](https://github.com/rubyzip/rubyzip) from 1.2.2 to 1.3.0.
- [Release notes](https://github.com/rubyzip/rubyzip/releases)
- [Changelog](https://github.com/rubyzip/rubyzip/blob/master/Changelog.md)
- [Commits](rubyzip/rubyzip@v1.2.2...v1.3.0)

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

Author: dependabot[bot]

examples/rails_app/Gemfile.lock

@@ -140,7 +140,7 @@ GEM
     ref (2.0.0)
     regexp_parser (1.3.0)
     ruby_dep (1.5.0)
-    rubyzip (1.2.2)
+    rubyzip (1.3.0)
     sass (3.7.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)