Updated support for sending files to the automations endpoint

[cdaviis]

This pull request includes several changes to improve the functionality and compatibility of the Zephyr Ruby client, as well as updates to documentation and configuration files. The most important changes include adding support for file uploads, updating dependencies, and enhancing the API client.

Enhancements to the Zephyr Ruby client:

• lib/zephyr_ruby/client.rb: Added faraday/multipart to support multipart requests and updated the Faraday client initialization to handle multipart and URL-encoded requests. [1] [2]
• lib/zephyr_ruby/connection.rb: Modified the post method to support file uploads by detecting the MIME type and using Faraday::UploadIO for file handling.
• lib/zephyr_ruby/resource/test_executions.rb: Added new methods to manage test steps and execution links, including get_test_steps, update_test_steps, sync_test_execution, get_test_execution_links, and create_test_execution_issue_link.

Updates to dependencies and configuration:

• .rubocop.yml: Updated RuboCop configuration to set the maximum method length to 13 and target Ruby version to 3.0.
• zephyr_ruby.gemspec: Updated the required Ruby version to 3.0 and changed the homepage URL. Removed unnecessary comments. [1] [2]

Documentation improvements:

• README.md: Updated the usage section to provide clearer instructions on setting up the API access token and client instantiation, and added a link to the official REST API documentation.

Version update:

• lib/zephyr_ruby/version.rb: Incremented the version number from 0.4.0 to 0.5.0.