[Snyk] Security upgrade rspec-rails from 6.0.3 to 6.0.4 (#5555)

* fix: Gemfile & Gemfile.lock to reduce vulnerabilities

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



* Update Gemfile.lock

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