Fix example transitive vulnerability for Ruby

To fix a transitive library for Ruby, override the transitive dependency by adding the appropriately versioned dependency as a direct library to your Gemfile.

These steps provide a fix for a Session Fixation vulnerability in rest-client, version 1.7.3 in the test-ruby-gem repository.

To complete this task:

1. Edit the Gemfile file in the root of the project and add the recommended version of the gem:

   gem 'rest-client', '1.8.0.rc1'

2. Run this command from your terminal within the project:

   bundle update rest-client  

3. Validate the fix.