Release v5.18.1

[arpit-jn]

Fixed

• Fixed a bug where passing an array as a request payload would delete its contents, causing API calls with array parameters to silently send empty data. (#697)

Changed

• Updated zache from 0.13.2 to 0.15.2
• Updated jwt from 2.9.3 to 2.10.2
• Updated addressable from 2.8.7 to 2.8.8

Security

• Removed unused coveralls and irb dev dependencies, eliminating OS Command Injection vulnerability in thor introduced transitively via coveralls
• Replaced dotenv-rails with standalone dotenv, removing the full Rails transitive dependency chain and resolving 5 XSS vulnerabilities in rails-html-sanitizer
• Upgraded rexml to 3.4.4 (via simplecov-cobertura and webmock upgrades) to fix XML Entity Expansion vulnerability

[arpit-jn]

Closing this release PR. Will be making additional changes and create new release PR.