fix: Gemfile & Gemfile.lock to reduce vulnerabilities (#4023)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-RACK-1061917



Co-authored-by: snyk-bot <snyk-bot@snyk.io>
Co-authored-by: Ahmad Farhat <ahmad.af.farhat@gmail.com>